function userInputNotEmpty(){

  var userinput_title = document.getElementById("userinput_title");
  var userinput_description = document.getElementById("userinput_description");
  var userinput_keywords = document.getElementById("userinput_keywords");
  var author = document.getElementById("author");
  var email = document.getElementById("email");
  
  var alphaExp = /^[0-9a-z _A-Z:&-+]+$/;
  
  if (userinput_title.value=="")
  {
        alert("Please enter in your title.")	
		return false;
  }
  if (userinput_description.value=="")
  {
        alert("Please enter in your description.")	
		return false;
  }
  if (userinput_keywords.value=="")
  {
        alert("Please enter in your keywords.")	
		return false;
  }
  if(author.value==""){
		alert("Please enter Author name.")
		return false;	
  }
   if(email.value==""){
		alert("Please enter Email address.")
		return false;	
  }
  if(userinput_title.value.match(alphaExp) || userinput_description.value.match(alphaExp) || userinput_keywords.value.match(alphaExp)){
        return true;
	};

  
}