//menu butons
		menu= new Array();
		menu[0]= new Image();
		menu[0].src= "images/home_off.gif";
		menu[1]= new Image();
		menu[1].src= "images/home_on.gif";
		menu[2]= new Image();
		menu[2].src= "images/about_off.gif";
		menu[3]= new Image();
		menu[3].src= "images/about_on.gif";
		menu[4]= new Image();
		menu[4].src= "images/products_off.gif";
		menu[5]= new Image();
		menu[5].src= "images/products_on.gif";
		menu[6]= new Image();
		menu[6].src= "images/contact_off.gif";
		menu[7]= new Image();
		menu[7].src= "images/contact_on.gif";

		function b_on(id) {
			var myImg= document.getElementById('img'+id);
			myImg.src= menu[id*2+1].src;
		}
		function b_off(id) {
			var myImg= document.getElementById('img'+id);
			myImg.src= menu[id*2].src;
		}