function checkform()
{
	  if(document.getElementById("username").value.replace(/^\s+/,"")== "")
	  {
	      alert("Please fill in your name!");
		  document.getElementById("username").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("phone").value.replace(/^\s+/,"") == "")
	  {
		alert("Please fill in your telephone number!");
		  document.getElementById("phone").focus();
		  return false;
	  }
	  */
      if(document.getElementById("Tcontent").value.replace(/^\s+/,"") == "")
	  {
		alert("Please fill in your message!");
		  document.getElementById("Tcontent").focus();
		  return false;
	  }
   return true;
}