function fnCheckNum(eventObj,obj)
 {
     
     var keyCode;
    
     if (document.all) {
         keyCode = eventObj.keyCode;
     }
     else {
         keyCode = eventObj.which;
     }
     var str = obj.value;
     if ((keyCode < 48 || keyCode > 58) && (keyCode != 8) && (keyCode != 0)) {
         
         return false;
     }
     return true;
 }