function checkfields(){
	var str = "";
		
	if (document.newsl.digi.value=="") {
		str = str + " E-mail\n";
	}else if ( document.newsl.digi.value.length > 0 && ( document.newsl.digi.value.indexOf("@",0) == -1 || document.newsl.digi.value.indexOf(".",0) == -1 ) ) {
			str += " a valid email \n"	;
	}
			
	 if(str == ""){
		  document.jform.action = "newsletter-subscribe.php";
		  document.jform.submit();
	 }
	 else {
			alert("please fill in :\n" + str);
	 }
}