var cwin=null;
function cpop(pagex,w,h){
if(!cwin){
var hc=(screen.availWidth/2)-(w/2);
var vc=(screen.availHeight/2)-(h/2);
var cwin=window.open(pagex,'popup','width='+w+',height='+h+',top='+vc+',left='+hc+',scrollbars=no,resize=false');
if(cwin.window.focus()){
setTimeout("cwin.window.focus()",5000);
}
}
}