function CheckNumber(obj)
		{
		   var string = obj.value;
		   var re = new RegExp("[^0-9]");
		   var isin = re.test(string);
		   	   if (isin)
					{
					alert("No Letters nor Special Characters Allowed : ' & ! # % ");
					obj.value = '';
					obj.focus();					
					}
				else
					return true;
		}