function shop_startup()
{
cx = document.body.clientWidth;
cy = document.body.clientHeight;
x = document.body.scrollWidth;
y = document.body.scrollHeight;
yo = document.body.scrollTop;
document.getElementById("popup_shadow").style.width=x;
document.getElementById("popup_shadow").style.height=y;
halfx=document.getElementById("popup").style.width.replace("px","")/2;
halfy=document.getElementById("popup").style.height.replace("px","")/2;
newleft=cx/2-halfx;
if(newleft < 0) newleft=0;
document.getElementById("popup").style.left=newleft;
//newtop=cy/2-halfy+yo;
newtop=yo;
if(newtop < 0) newtop=0;
document.getElementById("popup").style.top=newtop;
document.getElementById("popup_shadow").style.top=newtop;
}

function shop_show_item(id,pg,tbl)
{
//put page in frame and show it using id as tag
shop_startup();
document.getElementById("cat").style.visibility='hidden';
document.getElementById("subcat").style.visibility='hidden';
document.getElementById("manuf").style.visibility='hidden';
document.getElementById("item_frm").src='shop/shop_item.php?id=' + id + '&pg=' + pg + '&t=' + tbl;
document.getElementById("popup_shadow").style.visibility="visible";
document.getElementById("popup").style.visibility="visible";
//Use this to hide drop down filter box.
//document.getElementById("type").style.visibility='hidden';
}

function shop_hide_item()
{
//hide popup
document.getElementById("popup_shadow").style.visibility="hidden";
document.getElementById("popup").style.visibility="hidden";
document.getElementById("cat").style.visibility='visible';
document.getElementById("subcat").style.visibility='visible';
document.getElementById("manuf").style.visibility='visible';
//use this to show drop down filter box.
//document.getElementById("type").style.visibility='visible';
}