function random(){
i1 = Math.round(Math.random()*3)+1;
document.images['im1'].src = "images/header_gift_boxes/" + i1 +".jpg"

i2 = Math.round(Math.random()*2)+1;
document.images['im2'].src = "images/header_displays/" + i2 +".jpg"

i3 = Math.round(Math.random()*3)+1;
document.images['im3'].src = "images/header_boxes/" + i3 +".jpg"

i4 = Math.round(Math.random()*4)+1;
document.images['im4'].src = "images/header_watchwinders/" + i4 +".jpg"
}

var n = 1;
var f = false;
var b ;
function prel(){

   	if(document.images) {
	  str = 'images/p_o.gif';
               b = new Image();
               b.src = str;
               f = true;
 		}
}
function on(im){
	if (document.images && (f == true)) 
		{
		 document.images[im].src = "images/p_o.gif";}
		
}
function off(im){
	if (document.images && (f == true))
		document.images[im].src = "images/p.gif";
}