$(document).ready(function() {	
	initPreload();
});

initPreload = function() {
	var navBlock = ".preImg";
	
	$(navBlock+" img").each(function() {
		rollsrc = $(this).attr("src");
		if(rollsrc.match(/.jpg$/ig)) {
			rollON = rollsrc.replace(/.jpg$/ig,"_over.jpg");
		}else if(rollsrc.match(/.gif$/ig)) {
			rollON = rollsrc.replace(/.gif$/ig,"_over.gif");
		}
		
		$("<img>").attr("src", rollON);
	});
	
	$(navBlock+" a").mouseover(function(){
		imgsrc = $(this).children("img").attr("src");
		matches = imgsrc.match(/_over/);
		
		if (!matches) {
		if(imgsrc.match(/.jpg$/ig)) {
			imgsrcON = imgsrc.replace(/.jpg$/ig,"_over.jpg");
		}else if(imgsrc.match(/.gif$/ig)) {
			imgsrcON = imgsrc.replace(/.gif$/ig,"_over.gif");
		}
		
		$(this).children("img").attr("src", imgsrcON);
		}
		
	});
	$(navBlock+" a").mouseout(function(){
		$(this).children("img").attr("src", imgsrc);
	});
}