function pop_page(the_URL,page_name,pop_width,pop_height) {
   
//    var screen_height = window.screen.availHeight;
//   var screen_width = window.screen.availWidth; 

    var doPopUpX = parseInt((screen.availWidth/2) - (pop_width/2));
    var doPopUpY = parseInt((screen.availHeight/2) - (pop_height/2));   
    
    var pop_resize = "yes";
    var location = "no";
    var mbar = "no";
    var pos = "left="+doPopUpX+",top="+doPopUpY;

    open( the_URL ,page_name,"location="+location+",toolbar="+mbar+",resizable="+pop_resize+",scrollbars=yes,width="+pop_width+",height="+pop_height+"," + pos);
    } 
   
   

function Checkbox_ClientValidate(sender, args)
{
args.IsValid = (document.getElementById("TB_MoreInfo").checked);
}