function init_preload(){
	var img_arr = ["home_over.gif","volunteer_over.gif","donate_over.gif","issues_over.gif","biography_over.gif","news_over.gif","what_do_over.gif","contact_over.gif"];
	ao_preloadImage(img_arr,"images/");
}

function ao_preloadImage(preload_arr, prefix){
	var path_pre = prefix || "";
	var temp_img = new Array();
	for(i=0;i<preload_arr.length;i++){
		temp_img[i] = new Image();
		temp_img[i].src = path_pre+preload_arr[i];
	}
}

function ao_swapImage(me){
	me.old = me.src;
	me.src = me.src.substr(0, me.src.length-6)+"over.gif";
	me.onmouseout = function(){
		this.src = me.old;
	}
}