function changepic(img_name,img_src) {
document[img_name].src=img_src;
}

function preload() {
image01=new Image();
image01.src="images/menu-1-dot.gif";
image02=new Image();
image02.src="images/menu-1-on.gif";
image03=new Image();
image03.src="images/menu-2-dot.gif";
image04=new Image();
image04.src="images/menu-2-on.gif";
image05=new Image();
image05.src="images/menu-3-dot.gif";
image06=new Image();
image06.src="images/menu-3-on.gif";
image07=new Image();
image07.src="images/menu-4-dot.gif";
image08=new Image();
image08.src="images/menu-4-on.gif";
image09=new Image();
image09.src="images/menu-5-dot.gif";
image10=new Image();
image10.src="images/menu-5-on.gif";
image11=new Image();
image11.src="images/menu-6-dot.gif";
image12=new Image();
image12.src="images/menu-6-on.gif";
image13=new Image();
image13.src="images/menu-7-dot.gif";
image14=new Image();
image14.src="images/menu-7-on.gif";
image15=new Image();
image15.src="images/menu-8-dot.gif";
image16=new Image();
image16.src="images/menu-8-on.gif";
}