var my_w = 800; 
var my_h = 600; 
if (screen.width) { 
my_w = screen.width; 
} 
if (screen.height) { 
my_h = screen.height; 
} 
function showPopup(theUrl) 
{ 
strwidth="670"; 
var wintop = 0; 
var winleft = 0; 
wintop = parseInt((my_h/2) - 300); 
if (wintop < 0) wintop=0; 
winleft = parseInt((my_w/2) - 290); 
if (winleft < 0) winleft=0; 
if ((plat=="mac") && (!ns) && (wintop==0)){wintop=15;}  
if ((plat=="win") && (g3) && (!document.all)){strwidth="664";} 
WeirMineralsPopupWindow = window.open(DbURL + '/' + theUrl,"WeirMineralsPopupWindow","width=" + strwidth + ",height=480,resizable=no,scrollbars=yes,status=yes,location=no,menubar=yes,top="+wintop+",left="+winleft); 
WeirMineralsPopupWindow.focus(); 
}