function textLimitCheck(thisArea, maxLength)
{
  if (thisArea.value.length > maxLength)
	{
      alert(maxLength + ' Limit. \r Beyond will automatically remove.');
      thisArea.value = thisArea.value.substring(0, maxLength);
      thisArea.focus();
    }
    document.getElementById("textcount").innerHTML=thisArea.value.length;
  }
function checksn()
{
	  if (document.getElementById("sn").value=="")
	  {
	    alert("Not null!");
	    document.getElementById("sn").focus();
	    return false;
	  }	
	  
	}