function isNumberKey(evt)
      {
         var charCode = (evt.which) ? evt.which : event.keyCode
         if (charCode > 31 && (charCode < 48 || charCode > 57))
            return false;

         return true;
      }


   var maskpanel=function()
{
    this.divobj;
    this.show=function()
    {
      if(!document.getElementById("xdivmasking"))
      {
          var divEle=document.createElement('div');
          divEle.setAttribute("id","xdivmasking");
          document.body.appendChild(divEle);
          var divSty=document.getElementById("xdivmasking").style;
          divSty.position="absolute";divSty.top="0px";divSty.left="0px";divSty.zIndex="46";divSty.opacity=".50";divSty.backgroundColor="#000";
          divSty.filter="alpha(opacity=50)";

          var divFram=document.createElement('iframe');
          divFram.setAttribute("id","xmaskframe");
          document.body.appendChild(divFram);
          divSty=document.getElementById("xmaskframe").style;
          divSty.position="absolute";divSty.top="0px";divSty.left="0px";divSty.zIndex="45";divSty.border="none";divSty.filter="alpha(opacity=0)";
       }

       this.divobj=document.getElementById("xdivmasking");
       this.waitifrm=document.getElementById("xmaskframe");
       
       var bdh=document.documentElement.scrollHeight;
       var bdw=document.documentElement.scrollWidth;

       this.waitifrm.style.height=this.divobj.style.height=bdh+'px';
       this.waitifrm.style.width=this.divobj.style.width=bdw+'px';  
       this.waitifrm.style.display=this.divobj.style.display="block";
    };
    this.hide=function()
    {
        this.waitifrm.style.display=this.divobj.style.display="none";
    };
}