function Comprueba(){
	if (document.myform.nombre.value=="")
		alert ("Es necesario que indiques tu nombre");
	else if (document.myform.email.value=="")
		alert ("Es necesario que indiques tu Email");
	else if (!CyJS_Utils_IsEmailValid(document.myform.email.value))
		alert("El formato del email indicado no es correcto");
	else if (document.myform.comentario.value=="")
		alert ("Por favor indícanos la razón del contacto");
	else
		document.myform.submit();
}

function CyJS_Utils_IsEmailValid(checkThisEmail)
{
	var myEMailIsValid = true;
	var myAtSymbolAt = checkThisEmail.indexOf('@');
	var myLastDotAt = checkThisEmail.lastIndexOf('.');
	var mySpaceAt = checkThisEmail.indexOf(' ');
	var myLength = checkThisEmail.length;

	if (myAtSymbolAt < 1 )
	 {myEMailIsValid = false}

	if (myLastDotAt < myAtSymbolAt)
	 {myEMailIsValid = false}

	if (myLength - myLastDotAt <= 2)
	 {myEMailIsValid = false}

	if (mySpaceAt != -1)
	 {myEMailIsValid = false}

	return myEMailIsValid
}