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.alfaweb.info/scambioLink/download/form.php";
				document.a.submit();
			}
	}