function imchg(loc){
var model = document.getElementById("model").innerHTML;
var txt = loc.options[loc.selectedIndex].text;
if (txt == "Black on White") {
var attclr = "_bk_wt";}
else if (txt == "White on Black") {
var attclr = "_wt_bk";}
document.getElementById("img").src="/images/"+model+attclr+".jpg";}

function imgchg(){
var model = document.getElementById("model").innerHTML;
var txt = document.getElementById("clrchng").options[document.getElementById("clrchng").selectedIndex].text;
if (txt == "Black on White") {
var attclr = "_bk_wt";}
else if (txt == "White on Black") {
var attclr = "_wt_bk";}
document.getElementById("img").src="/images/"+model+attclr+".jpg";}

function imgChange(loc)
{var txt=loc.options[loc.selectedIndex].value;
document.getElementById("img").src="/images/"+txt+".gif";
}

function popupWindow() {
var xyz = document.getElementById("img").src;
window.open(xyz,'','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=yes,copyhistory=no,width=500,height=400,screenX=150,screenY=150,top=150,left=150')
}

function cart_img_chg() {
if (document.getElementById("num").value > 0){
var end = document.getElementById("num").value;
var s = 0;
for (s=0;s<=end;s++){
document.getElementById("img"+s).src = document.getElementById("cart_img"+s).value;
}}}