/*
	Standards Compliant Rollover Script
	Author : Daniel Nolan
	http://www.bleedingego.co.uk/webdev.php
	
	Add the attribute class="imgover" to any image in your document that requires a mouseover effect to be trigger
        Hover image is named exactly the same as the original image plus _o at the end of name
*/

function initRollovers() {

	if (!document.getElementById) return
	
	var aPreLoad = new Array();
	var sTempSrc;
	var aImages = document.getElementsByTagName('img');

	for (var i = 0; i < aImages.length; i++) {		
	
		//there may be multiple class assignments
		//separates the img class into an array
		classes = aImages[i].className.split(" ");
				
		//checks if img has a class of menu
		//if so, set up rollover
		if ( inArray('imgover', classes) ) {

			var src = aImages[i].getAttribute('src');
			var ftype = src.substring(src.lastIndexOf('.'), src.length);
			var hsrc = src.replace(ftype, '_o'+ftype);

			aImages[i].setAttribute('hsrc', hsrc);
			
			aPreLoad[i] = new Image();
			aPreLoad[i].src = hsrc;
			
			aImages[i].onmouseover = function() {
				sTempSrc = this.getAttribute('src');
				this.setAttribute('src', this.getAttribute('hsrc'));
			}	
			
			aImages[i].onmouseout = function() {
				if (!sTempSrc) sTempSrc = this.getAttribute('src').replace('_o'+ftype, ftype);
				this.setAttribute('src', sTempSrc);
			}

		}
	}
}

function inArray( value, array ) {
//passed a value and an array, this function returns true
//if the value is contained with in the array,
//false if it is not

	for ( var i = 0; i < array.length; i++ )
		if ( array[i] == value )
			return true;
	return false;


} 

//adds functions to the windows onload event
function addOnload(newFunction) {
  var oldOnload = window.onload;
    // does window.onload exist
  if (typeof oldOnload == "function") {
            //overwriting existing onload
              window.onload = function() {
                  if (oldOnload) {oldOnload();}
                  newFunction();
              }
          }
          else {
              window.onload = newFunction;
          }
} 

addOnload(initRollovers);

/***This one does the instant popdowns***/
            
        function showhide_pref(which)
        {
        	off = which + '_off';
        	on  = which + '_on';
        
			if (document.getElementById(off).style.display == "block")
			{
				document.getElementById(off).style.display = "none";
				document.getElementById(on).style.display = "block";				
        	}
        	else
        	{
				document.getElementById(off).style.display = "block";
				document.getElementById(on).style.display = "none";
        	}
        }
    
	
		var chunk	= new Array(1);
		chunk[0]  = "search";
		chunk[1]  = "vet_login";
		chunk[2]  = "more";

		
		var state = 'closed';
		
		function showhide_chunk()
		{
			for (i = 0 ; i < chunk.length; i++ )
			{								
				off = chunk[i] + '_off';
				on  = chunk[i] + '_on';
				
				if (state == 'closed' && document.getElementById(off).style.display)
				{
					document.getElementById(off).style.display = "block";
					document.getElementById(on).style.display = "none";	
				}
				else
				{
					document.getElementById(off).style.display = "none";
					document.getElementById(on).style.display = "block";
				}
			}
			
			if (state == 'closed')
				state = 'open';
			else
				state = 'closed';
		}