var arrow = new Array()
arrow[1] = "images/arrow_over.gif"
arrow[2] = "images/arrow.gif"
arrow[3] = "images/arrow_click.gif"
var arr = new Array()

function preload_images(){
for (var i = 1; i < arrow.length; i++){
       arr[i] = new Image();
       arr[i].src = arrow[i];}
}
	   
function arrOver(num){
eval("document.arr"+num+".src = 'images/arrow_over.gif'");
}

function arrOut(num){
eval("document.arr"+num+".src = 'images/arrow.gif'");
}