function checkcontact() {
	if (document.getElementById('fname').value == "") {
		alert('Please insert your \"First Name\"');
		document.getElementById('fname').focus();
		return false;
	}
	if (document.getElementById('lname').value == "") {
		alert('Please insert you \"Last Name\"');
		document.getElementById('lname').focus();
		return false;
	}
	if (document.getElementById('email').value == "") {
		alert('Please insert your \"E-mail\"');
		document.getElementById('email').focus();
		return false;
	} else {
		p1 = document.getElementById('email').value.indexOf('@');
		p2 = document.getElementById('email').value.indexOf('.', p1);
		p3 = document.getElementById('email').value.length;
		if(!(p1 >= 3 && p2 >= 6 && p3 >= 9)){
			alert('You need insert a valid e-mail');
			document.getElementById('email').focus();
			return false;
		}
	}
 
	if (document.getElementById('phone').value == "") {
		alert('Please insert your \"Phone\"');
		document.getElementById('phone').focus();
		return false;
	}
	if (document.getElementById('comentario').value == "") {
		alert('Please insert a \"Comment\"');
		document.getElementById('comentario').focus();
		return false;
	} 
}

function popup(url,x,y,nome){
		window.open(url,nome,'directories=0,height='+y+',width='+x+',location=0,top='+((screen.availHeight-y)/2)+',left='+((screen.availWidth-x)/2)+',resizable=0,scrollbars=0,toolbar=0,status=0');
}