function NewWindow(mypage, myname, w, h, scroll) {
	var winl = (screen.width - w) / 2;
	var wint = (screen.height - h) / 2;
	winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',noresize'
	win = window.open(mypage, myname, winprops)
	if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
}

function validateForm() {
	if (document.forms[0].elements[1].value == "") {
			alert ("Por favor, indique su nombre");
			return false;
	}

	if (document.forms[0].elements[3].value == "") {
		alert ("Por favor, indique su e-mail");
		return false;
	} else {
		if (!isEmailAddress(document.forms[0].elements[3].value)){
		    alert("Por favor, indique una dirección de e-mail válida");
			return false;
		}
	}
}

function validateFormEng() {
	if (document.forms[0].elements[1].value == "") {
			alert ("Please, write your name");
			return false;
	}

	if (document.forms[0].elements[3].value == "") {
		alert ("Please, write your e-mail");
		return false;
	} else {
		if (!isEmailAddress(document.forms[0].elements[3].value)) {
	    alert("Please, write a valid e-mail address");
		return false;
		}
	}
}

function isEmailAddress(val) {
	if (val.match(/^([a-zA-Z0-9])+([.a-zA-Z0-9_-])*@([a-zA-Z0-9_-])+(.[a-zA-Z0-9_-]+)+/)) {
		return true;
	} else {
		return false;
	}	
}