function checkForm(){
	var email 				= document.a.email.value;
	var email_reg_exp 		= /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-]{2,})+\.)+([a-zA-Z0-9]{2,})+$/;
	var webSite 			= document.a.webSite.value;
	var yourLink			= document.a.yourLink.value;
	var title 				= document.a.title.value;
	var description			= document.a.description.value;
	
	if ((email == "") || (email == "undefined")){
		alert('EMAIL is required.');
		document.a.email.focus();
	}
	else if (email != "" && !email_reg_exp.test(email)){
		alert('EMAIL is not correct.');
		document.a.email.value = '';
		document.a.email.focus();
	}
	else if ((webSite == "") || (webSite == "undefined")){
		alert('WEB SITE is required.');
		document.a.webSite.focus();
	}
	else if ((yourLink == "") || (yourLink == "undefined")){
		alert('YOUR LINK is required.');
		document.a.yourLink.focus();
	}	
	else if ((title == "") || (title == "undefined")){
		alert('TITLE is required.');
		document.a.title.focus();
	}	
	else if ((description == "") || (description == "undefined")){
		alert('DESCRIPTION is required.');
		document.a.description.focus();
	}	
else{
document.a.action = "http://www.anteosrl.com/scambioLink/download/form.php";
document.a.submit();
}
}