// JavaScript Document
<!--
function MM_jumpMenu(targ,selObj,restore){ //v3.0
  eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
  if (restore) selObj.selectedIndex=0;
}
//-->

function isEmpty() {

strfield1 = document.forms[0].keyword.value 

    if (strfield1 == "" || strfield1 == null)
    {
    alert("Inserisci una parola da cercare!")
    return false;
    }
	
    return true;
}

//function that performs all functions, defined in the onsubmit event handler

function check(form){
if (isEmpty(form.keyword)){
		  return true;
	}
	return false;
}