function checkform()
{
	  if(document.getElementById("links_title").value.replace(/^\s+/,"")== "")
	  {
	      alert("Please fill in your link title!");
		  document.getElementById("links_title").focus();
		  return false;
	  }
	  if(document.getElementById("links_url").value.replace(/^\s+/,"")== "")
	  {
	      alert("Please fill in your link url!");
		  document.getElementById("links_url").focus();
		  return false;
	  }	
	  if(document.getElementById("email").value.replace(/^\s+/,"") == "")
	  {
	      alert("Please fill in your email.");
		  document.getElementById("email").focus();
		  return false;
	  }
	  var   patrn =/^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/;     
	  if(!patrn.exec(document.getElementById("email").value))     
	  {   
		  alert("Wrong email format!");   
		  document.getElementById("email").focus();   
		  return false;   
	  }   
	  if(document.getElementById("links_reponse").value.replace(/^\s+/,"") == "")
	  {
	      alert("Please fill in your reponse link.");
		  document.getElementById("links_reponse").focus();
		  return false;
	  }
   return true;
}