function clearField( field_name )
{
	document.getElementById( field_name ).value = '';
	document.getElementById( field_name ).style.backgroundColor = '';
}

function highlightFields( field_str )
{
	var fields = field_str.split(',');
	
	for( var i=0; i<fields.length; i++ )
	{
		highlightField( fields[i], '#F6F5CF' ); 
	}
	
}


function highlightField( field_name, field_color )
{
	document.getElementById( field_name ).style.backgroundColor = field_color;
}


function formatCurrency(num) 
{
	num = num.toString().replace(/\$|\,/g,'');
	if(isNaN(num))
	num = "0";
	sign = (num == (num = Math.abs(num)));
	num = Math.floor(num*100+0.50000000001);
	cents = num%100;
	num = Math.floor(num/100).toString();
	if(cents<10)
	cents = "0" + cents;
	for (var i = 0; i < Math.floor((num.length-(1+i))/3); i++)
	num = num.substring(0,num.length-(4*i+3))+','+
	num.substring(num.length-(4*i+3));
	return (((sign)?'':'-') +  num + '.' + cents);
}	//end function

function validate_required_fields(frmName, strTextBoxes)
{
	var oForm = document.getElementById(frmName);
	
	//turn the comma separated list into an array
	var arrBoxes = strTextBoxes.split(",");
	
	error = 0;
	
	//loop thru each box and determine if the text value is empty
	for( var intCount = 0; intCount < arrBoxes.length; intCount++ )
	{
		arrBoxes[intCount] = arrBoxes[intCount].trim_spaces();
		
		//alert( "inCount: " + intCount + " - text box: -->" + arrBoxes[intCount] + "<--" );
		
		var strText = document.getElementById(arrBoxes[intCount]).value;
		
		if( strText.length == 0 )
		{
			error++;
			
		}	//end if
		
	}	//end for loop
	
	//if any errors, then user did not enter all the required fields
	if( error > 0 )
	{
		alert( "Please enter all the required fields." );
		
		valid = false;
		
	}	//end if
	
	else
	{
		valid = true;
		
	}	//end else
	
	return valid;
	
}	//end function

function pop_templates()
{
	window.open('pop_templates.php','admin_pop','width=600,height=400,scrollbars=yes,resizable=yes');	
}

//removes all spaces in a string
function removespaces() 
{
	return this.replace(/.*\S/,'');
	
}	//end function

//trims leading and trailing spaces
function trim_spaces() 
{
	return this.replace(/^\s+/,'').replace(/\s+$/,'');
	
}	//end function

function clear_image( field_id )
{
	document.getElementById( 'pg-' + field_id ).src = 'images/spacer.gif';
	document.getElementById( field_id ).value = '';
	document.getElementById( field_id + '_filename' ).value = '';
}

function clear_link( field_id )
{
	document.getElementById( field_id ).value = '';
	document.getElementById( field_id + '_text' ).innerHTML = '';
	document.getElementById( field_id + '_text' ).style.backgroundColor = '';
}

function showregisterform( field_name ) {
	var checkDiv = document.getElementById("check_fields");
	var creditDiv = document.getElementById("credit_fields");
	var billDiv = document.getElementById("bill_fields");
	var paidDiv = document.getElementById("paid_fields");
	setClassName(checkDiv,"hidden");
	setClassName(creditDiv,"hidden");
	setClassName(billDiv,"hidden");
	setClassName(paidDiv,"hidden");
	if( field_name == "check" ) { setClassName(checkDiv,"visible"); }
	else if( field_name == "credit" ) { setClassName(creditDiv,"visible"); }
	else if( field_name == "bill" ) { setClassName(billDiv,"visible"); }
	else if( field_name == "paid" ) { setClassName(paidDiv,"visible"); }
}

/***********************************************************
* class name functions
***********************************************************/
function getClassName(element) {
	if( element ) {
		var className = (document.all && document.getElementById ? element.className : element.getAttribute("class"));
		return className;
	}
}
function setClassName(element,style) {
	if( element ) {
		if( document.all && document.getElementById ) element.className=style;
		else element.setAttribute("class", style);
	}
}

function switch_bg()
	{
		var styles_arr = new Array(); 
		styles_arr[0] = new Array('url(images/plaid_bg.jpg) repeat');
		styles_arr[1] = new Array('url(images/cork_bg.jpg) repeat');
		styles_arr[2] = new Array('url(images/grass_bg.jpg) repeat');
		
		var styleItems = styles_arr.length;
		var randomNumber = Math.round( (styleItems-1) * Math.random() );
		
		document.getElementById('body-tag').style.background = styles_arr[randomNumber];	
	
	}
	
function update_image_link (element_id, image_path)
	{
		document.getElementById(element_id).src = 'images/'+image_path;
	}

function test_function(x)
{
	if (document.getElementById('test').checked)
	{
		for (c=0;c<x;c++)
		{
			str_element = 'recursion_event_'+c;
			document.getElementById(str_element).checked = true;
		}
	}
	else
	{
		for (c=0;c<x;c++)
		{
			str_element = 'recursion_event_'+c;
			document.getElementById(str_element).checked = false;
		}
	}
}
/***********************************************************
* switches background image of username input field
***********************************************************/
function inputUsername(action) {
	var field = document.getElementById('username');
	if( action=='on' ) {
		if( field.value=='' ) {
			field.style.background = "none";
		}
	}
	else if( action=='off' ) {
		if( field.value=='' ) {
			field.style.background = "url(images/bgUsername.gif) center left no-repeat #fff";
		}
	}
}

/***********************************************************
* switches background image of username input field
***********************************************************/
function inputPassword(action) {
	var field = document.getElementById('password');
	if( action=='on' ) {
		if( field.value=='' ) {
			field.style.background = "none";
		}
	}
	else if( action=='off' ) {
		if( field.value=='' ) {
			field.style.background = "url(images/bgPassword.gif) center left no-repeat #fff";
		}
	}
}

function $(element_id) {
	var thisElement = document.getElementById(element_id);
	if(thisElement)
		return thisElement;
}

// Hide or show elements on a page
// nodeIds - ID of one or more (separated by "|") elements on a page
// visTo - takes a value of 0 or 1 to set visibility as either none or block (by default)
// visType (optional) - allows override of default block visibility type for other options (e.g. inline, table-row-group, etc.)
function hide_show(nodeIds, visTo, visType)
{
	var nodeIdArr = nodeIds.split("|");
	
	for(i=0; i<nodeIdArr.length; i++) {
		var nodeId = nodeIdArr[i];
		var thisNode = $(nodeId);
		
		// check for node's current visibility
		if(visTo == 1) {
			if(visType) {
				if( (visType == "table-row-group" || visType == "table-row") && document.all ) visType = "block";
				thisNode.style.display = visType;
			} else {
				thisNode.style.display = "block";
			}
		} else if(visTo == 0) {
			thisNode.style.display = "none";
		} else { // find node current vis and assume the opposite
			var currVis = thisNode.style.display;
			
			if(currVis) {
				if(currVis == "none")
					thisNode.style.display = ( visType ? visType : "block" );
				else
					thisNode.style.display = "none";
			} else if(thisNode.className == "no_show") {
				thisNode.style.display = ( visType ? visType : "block" );
			} else { // assume element starts as visible
				thisNode.style.display = "none";
			}
		}
	}
}

function swap_expand_icons(clicked_header) {
	var curr_class = clicked_header.className;

	if( curr_class == "expandable")
		var new_class = "contractable";
	else
		var new_class = "expandable";

	clicked_header.className = new_class;
}

//change session price displaying
function changePrice(price_type){
	var ids = document.getElementById('session_list');
	var list = ids.value.split('|');
	
	for( var i=0; i<=(list.length - 1); i++ ){
		if( price_type == 'general' ){
			document.getElementById('cost_general'+list[i]).style.display = 'block';
			document.getElementById('cost_patron'+list[i]).style.display = 'none';
		}
		else if( price_type == 'patron' ){
			document.getElementById('cost_general'+list[i]).style.display = 'none';
			document.getElementById('cost_patron'+list[i]).style.display = 'block';
		}
	}

}


//assigns a new function to string types
String.prototype.removespaces = removespaces;
String.prototype.trim_spaces = trim_spaces;