var hm_off = new Image();
    hm_off.src = "pics/home.png";
var hm_on = new Image();
    hm_on.src = "pics/home_on.png";

var vu_off = new Image();
    vu_off.src = "pics/vu.png";
var vu_on = new Image();
    vu_on.src = "pics/vu_on.png";    

var wh_off = new Image();
    wh_off.src = "pics/wh.png";
var wh_on = new Image();
    wh_on.src = "pics/wh_on.png";    

var ac_off = new Image();
    ac_off.src = "pics/ac.png";
var ac_on = new Image();
    ac_on.src = "pics/ac_on.png";

var op_off = new Image();
    op_off.src = "pics/op.png";
var op_on = new Image();
    op_on.src = "pics/op_on.png";    

var ct_off = new Image();
    ct_off.src = "pics/ct.png";
var ct_on = new Image();
    ct_on.src = "pics/ct_on.png";    

function MouseOn(imageName)	{
	document.images[imageName].src = eval(imageName + "_on.src");
}
function MouseOff(imageName)	{
	document.images[imageName].src = eval( imageName + "_off.src" );
}

function open_window(url,w,h) {
	newWindow = window.open(url,"center",'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0,width='+w+',height='+h);
	newWindow.focus();
};