function _login_msg(){

	alert("You must be logged in to view listings. \n\n A membership is required.");

}

function _total(){

	var obj, i, total;
	var f = document.f1;
	total = "0";

	// get val from radio
	var obj = f.certification_fee;	
	for(i = 0; i < obj.length; i++){
		if(obj[i].checked){
			total = obj[i].value;
		}
	}
	
	// value will have $ prefix or might say "call for info..."
	total = total.replace("$", "");
	total = parseInt(total, 10); 
	if(isNaN(total)){
		total = 0;
	}

	f.total.readOnly = false; 	
	f.total.value = "$" + total + ".00";	
	f.total.readOnly = true; 	

}


function _approve_deny(post_id, action){

	if(!confirm("Are you sure you want to " + action + " this post?"))
		return false;

	window.location.href = "forum_post.php?mode=approve_deny&post_id=" + post_id + "&action=" + action;

}


function _ready_for_approval(){

	if(!_validate(document.post))
		return false;	

	if(!confirm("Are you sure you want to submit this post for approval?\n\nOnce submitted, you may not change the post."))
		return false;

	document.post.mode.value = 'update';
	document.post.ready_for_approval.value = '1';
	document.post.submit();

}


function _select(ctl, val){

	for(i = 0; i < ctl.options.length; i++)
		if(ctl.options[i].value == val){
			ctl.selectedIndex = i;
			break;
		}
}

function _check_all(f){

	for(var i = 0; i < f.elements.length; i++)
		if(f.elements[i].type == 'checkbox')
			if(f.elements[i].checked)
				f.elements[i].checked = false;
			else
				f.elements[i].checked = true;
}

function _focus(){

	// focus first input
	var i = 0;
	var j = 0;
	var d = document.forms;
	for(i = 0; i < d.length; i++)
		for(j = 0; j < d[i].elements.length; j++)
			if((d[i].elements[j].type == "text" || d[i].elements[j].type == "select-one")){
				d[i].elements[j].focus();
				return;
			}
}


function _validate(f){

	// generic client side validation 
	
	if(!f.validate)
		return true;

	if(f.validate.value.length == 0)
		return true;

	// input format: field_name|title|field_name|title...
	var arr = f.validate.value.split("|");

	var i = 0;
	var title = "";
	var field_name = "";
	var field_value = "";
	var obj = null;
	var msg = "";
	var focused = false;
	var regexp = '';

	for(i = 0; i < arr.length; i++){

		field_name = arr[i];
		i++;
		title = arr[i];

		obj = eval("document." + f.name + "." + field_name);

		if(!obj)
			continue;

		if(obj.type == "select-one")
			field_value = obj.options[obj.selectedIndex].value; 
		else	
			field_value = obj.value; 

		if(field_value.length == 0){
			msg = msg + title + " is required\n";
			obj.className = 'input_error';
			if(!focused)
				obj.focus();
		}
		else if(field_name == "email")
			if(!field_value.match(/^([a-z0-9_\.\-])+\@(([a-z0-9\-])+\.)+([a-z0-9]{2,4})+$/i)){
				msg = msg + title + " appears to be invalid\n";
				obj.className = 'input_error';
				if(!focused)
					obj.focus();
			}

		// flag so we only set focus once
		if(msg.length > 0)
			focused = true;
	}

	if(msg.length == 0)
		return true;

	alert(msg);
	return false;

}


function _delete(subject){
	
	if(subject === undefined)
		subject = "record";

	if(confirm("Are you sure you want to delete this " + subject + "?"))
		return true;
	else
		return false;

}


function _date(ctl){

	var str = ctl.value;
	var invalid = false;
	var arr;
	var y = 0, m = 0, d = 0, x = 0;

	// trim and quit on no input
	str = str.replace(/^\s+|\s+$/g, '');
	if(str.length == 0)
		return;

	// parse
	arr = str.split(/\//g);
	if(arr.length == 3){
		x = arr[2];
		y = arr[2];
		d = arr[1];
		m = arr[0];
	}

	// validate
	if(y < 1880 || y > 2100)
		y = 0;
	if(m < 1 || m > 12)
		m = 0;
	if(d < 1 || d > 31)
		d = 0;

	if(y == 0 || m == 0 || d == 0){
		if(x.length == 2)
			alert("Invalid Date. Expected format mm/dd/yyyy\n\nYear must be 4 digits.");
		else
			alert("Invalid Date. Expected format mm/dd/yyyy");
		ctl.focus();
		return;
	}

}


function _calendar(element_id){

	// format args for calendar
	obj = document.getElementById(element_id);
	if(obj.form.name.length == 0){
		alert("Error: Missing form name");
		return;
	}
	str_target = "document." + obj.form.name + "." + obj.name;
	str_datetime = obj.value;
	show_calendar(str_target, str_datetime);

}


function show_calendar(str_target, str_datetime){

	// 3rd party calendar - note cal calls itself so don't tweak args

	var arr_months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];
	var week_days = ["Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"];
	var n_weekstart = 0; // day week starts from (normally 0 or 1)

	var dt_datetime = (str_datetime == null || str_datetime == "" ?  new Date() : str2dt(str_datetime));
	var dt_prev_month = new Date(dt_datetime);
	dt_prev_month.setMonth(dt_datetime.getMonth()-1);
	var dt_next_month = new Date(dt_datetime);
	dt_next_month.setMonth(dt_datetime.getMonth()+1);
	var dt_firstday = new Date(dt_datetime);
	dt_firstday.setDate(1);
	dt_firstday.setDate(1-(7+dt_firstday.getDay()-n_weekstart)%7);
	var dt_lastday = new Date(dt_next_month);
	dt_lastday.setDate(0);
	
	// print calendar header
	var str_buffer = new String (
		"<html>\n"+
		"<head>\n"+
		"	<title>Calendar</title>\n"+
		"</head>\n"+
		"<body bgcolor=\"White\">\n"+
		"<table class=\"clsOTable\" cellspacing=\"0\" border=\"0\" width=\"100%\">\n"+
		"<tr><td bgcolor=\"#4682B4\">\n"+
		"<table cellspacing=\"1\" cellpadding=\"3\" border=\"0\" width=\"100%\">\n"+
		"<tr>\n	<td bgcolor=\"#4682B4\"><a href=\"javascript:window.opener.show_calendar('"+
		str_target+"', '"+ dt2dtstr(dt_prev_month)+"'+document.cal.time.value);\" style=\"color:#fff;\">"+
		"&lt;</a></td>\n"+
		"	<td bgcolor=\"#4682B4\" colspan=\"5\">"+
		"<font color=\"white\" face=\"tahoma, verdana\" size=\"2\">"
		+arr_months[dt_datetime.getMonth()]+" "+dt_datetime.getFullYear()+"</font></td>\n"+
		"	<td bgcolor=\"#4682B4\" align=\"right\"><a href=\"javascript:window.opener.show_calendar('"
		+str_target+"', '"+dt2dtstr(dt_next_month)+"'+document.cal.time.value);\" style=\"color:#fff;\">"+
		"&gt;</a></td>\n</tr>\n"
	);

	// print weekdays titles
	var dt_current_day = new Date(dt_firstday);
	str_buffer += "<tr>\n";
	for (var n=0; n<7; n++)
		str_buffer += "	<td bgcolor=\"#87CEFA\">"+
		"<font color=\"white\" face=\"tahoma, verdana\" size=\"2\">"+
		week_days[(n_weekstart+n)%7]+"</font></td>\n";
	// print calendar table
	str_buffer += "</tr>\n";
	while (dt_current_day.getMonth() == dt_datetime.getMonth() ||
		dt_current_day.getMonth() == dt_firstday.getMonth()) {
		// print row heder
		str_buffer += "<tr>\n";
		for (var n_current_wday=0; n_current_wday<7; n_current_wday++) {
				if (dt_current_day.getDate() == dt_datetime.getDate() &&
					dt_current_day.getMonth() == dt_datetime.getMonth())
					// print current date
					str_buffer += "	<td bgcolor=\"#FFB6C1\" align=\"right\">";
				else if (dt_current_day.getDay() == 0 || dt_current_day.getDay() == 6)
					// weekend days
					str_buffer += "	<td bgcolor=\"#DBEAF5\" align=\"right\">";
				else
					// print working days of current month
					str_buffer += "	<td bgcolor=\"white\" align=\"right\">";

				if (dt_current_day.getMonth() == dt_datetime.getMonth())
					// print days of current month
					str_buffer += "<a href=\"javascript:window.opener."+str_target+
					".value='"+dt2dtstr(dt_current_day)+"'+document.cal.time.value; window.close();\">"+
					"<font color=\"black\" face=\"tahoma, verdana\" size=\"2\">";
				else 
					// print days of other months
					str_buffer += "<a href=\"javascript:window.opener."+str_target+
					".value='"+dt2dtstr(dt_current_day)+"'+document.cal.time.value; window.close();\">"+
					"<font color=\"gray\" face=\"tahoma, verdana\" size=\"2\">";
				str_buffer += dt_current_day.getDate()+"</font></a></td>\n";
				dt_current_day.setDate(dt_current_day.getDate()+1);
		}
		// print row footer
		str_buffer += "</tr>\n";
	}
	// print calendar footer
	str_buffer +=
		"<form name=\"cal\">\n<tr><td colspan=\"7\" bgcolor=\"#87CEFA\">"+
		"<font color=\"White\" face=\"tahoma, verdana\" size=\"2\">"+
		"<input type=\"hidden\" name=\"time\" value=\""+dt2tmstr(dt_datetime)+
		"\" size=\"8\" maxlength=\"8\"></font></td></tr>\n</form>\n" +
		"</table>\n" +
		"</tr>\n</td>\n</table>\n" +
		"</body>\n" +
		"</html>\n";

	var vWinCal = window.open("", "Calendar", 
		"width=200,height=250,status=no,resizable=yes,top=200,left=200");
	vWinCal.opener = self;
	var calc_doc = vWinCal.document;
	calc_doc.write (str_buffer);
	calc_doc.close();
}


function str2dt (str_datetime) {
	str_datetime = str_datetime.replace(" ", "");
	var re_date = /^(\d+)\/(\d+)\/(\d+)$/;
	if (!re_date.exec(str_datetime))
		return alert("Invalid Date Format: "+ str_datetime);
	return (new Date (RegExp.$3, RegExp.$1-1, RegExp.$2, 0, 0, 0));
	return true;
}


function dt2dtstr (dt_datetime) {
	return (new String((dt_datetime.getMonth()+1)+"/"+dt_datetime.getDate()+"/"+dt_datetime.getFullYear()+""));
}


function dt2tmstr (dt_datetime) {
	return "";
}