var myimages=new Array()
function preloadimages(){
	for (i=0;i<preloadimages.arguments.length;i++){
		myimages[i]=new Image();
		myimages[i].src=preloadimages.arguments[i];
	}
}

preloadimages
(
"images/nav_left_bg.jpg",
"images/nav_right_bg.jpg"
)