function swapImg(imgName, imgSrc)
{
	document.images[imgName].src = imgSrc;
}

function preloadImages(imgPrefix, imgArray)
{
	for (var i=0; i<imgArray.length; i++)
	{
		var img = new Image();
		img.src = imgPrefix + imgArray[i];
	}
}

var topPrefix = "menu-images/top-menu/";
var leftPrefix = "menu-images/left-menu/";

var topImages = new Array();
topImages[0] = "home-on.jpg";
topImages[1] = "aboutus-on.jpg";
topImages[2] = "products-on.jpg";
topImages[3] = "testimonials-on.jpg";
topImages[4] = "contactus-on.jpg";

var leftImages = new Array();
leftImages[0] = "steelstrapping-on.jpg";
leftImages[1] = "plasticstrapping-on.jpg";
leftImages[2] = "seals-on.jpg";
leftImages[3] = "dispensers-on.jpg";
leftImages[4] = "tools-on.jpg";

preloadImages(topPrefix, topImages);
preloadImages(leftPrefix, leftImages);

function filterLists()
{
	var catList = document.forms[0].elements["lstMainCategory"];
	var catID = catList.options[catList.selectedIndex].value;
	var url = "products-search.asp?mcid=" + catID;
	location = url;
}

function clearSearchLists()
{
	var elem = null;
	for (var i=0; i<document.forms[0].elements.length; i++)
	{
		elem = document.forms[0].elements[i];
		if (elem.type.indexOf("select") != -1)
			elem.selectedIndex = 0;
	}
}