function bodyLoad(currentNav){
	var menuTable = document.getElementById('menu_table');
	var imgs = getElementsByClass('linkImage', menuTable, 'img');
	var i;
	var overFunction = function(){
		rollOver(this);
	};
	var offFunction = function(){
		rollOff(this);
	}
	for (i=0; i<imgs.length; i++){
		var img = imgs[i];
		img.onmouseover = overFunction;
		img.onmouseout = offFunction;
	}
	if (currentNav==null) return;
	var currentNavItem = document.getElementById(currentNav+'_link');
	rollOver(currentNavItem);
	setActive(currentNavItem, true);
}

function rollOver(img) {
	var active = img.getAttribute('active');
	if (active!=null&&active=='true') return;
	var oldSrc = img.getAttribute('src');
	var index1 = oldSrc.lastIndexOf('/');
	var index2 = oldSrc.lastIndexOf('.');
	
	var path = oldSrc.substring(0, index1+1);
	var imgName = oldSrc.substring(index1+1, index2);
	var ext = oldSrc.substring(index2, oldSrc.length);
	
	var newSrc = path + imgName + 'Over' + ext;
	img.setAttribute('src', newSrc);	
}

function rollOff(img) {
	var active = img.getAttribute('active');
	if (active!=null&&active=='true') return;
	var oldSrc = img.getAttribute('src');
	var index1 = oldSrc.lastIndexOf('/');
	var index2 = oldSrc.lastIndexOf('.');
	
	var path = oldSrc.substring(0, index1+1);
	var imgName = oldSrc.substring(index1+1, index2);
	var ext = oldSrc.substring(index2, oldSrc.length);
	
	imgName = imgName.replace(/Over/, "");
	
	var newSrc = path + imgName + ext;
	img.setAttribute('src', newSrc);	
}

function setActive(img, active){
	img.setAttribute('active', active);
}