function Validator(sUserName){
      if (sUserName.replace(' ', '').length >= 4 ){
         var xOffset = (screen.width - 320)/2;
         var yOffset = (screen.height - 140)/2;
         var myWindow = window.open('moz_validator.asp?UserName=' + sUserName,'MozValidator','width=320,height=140,top=' + yOffset + ',left=' + xOffset);
         myWindow.focus();
      }else{
         alert('Please enter a valid Member ID!!');
      }
   }