function validate(f) 
	{
	  if (f.name.value=="") {
        alert("Please add your name!");
        f.name.focus();
        return false;
        }    
	    charset=new RegExp("^[^.]+(\.[^.]+)*@([^.]+[.])+[a-z]{2,3}$");
      if (!charset.test(f.email.value))
         {
         window.alert("Please input valid email address!");
         f.email.focus();
         return false;
         }
	  if (f.projectbrief.value=="") {
        alert("Please add your project brief!");
        f.projectbrief.focus();
        return false;
        }    

return true; 
}