function EmailCheck (EmailStr) {
	var EmailPat=/^(.+)@(.+)$/;
	var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]";
	var validChars="\[^\\s" + specialChars + "\]";
	var quotedUser="(\"[^\"]*\")";
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
	var atom=validChars + '+';
	var word="(" + atom + "|" + quotedUser + ")";
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
	var matchArray=EmailStr.match(EmailPat);
	if (matchArray==null) {
		errMsg = "Email address seems incorrect (check @ and .'s)";
		return false;
	}
	var user=matchArray[1];
	var domain=matchArray[2];
	// See if "user" is valid
	if (user.match(userPat)==null) {
	    // user is not valid
	    errMsg = "The username of the Email address doesn't seem to be valid.";
	    return false;
	}
	var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null) {
	    // this is an IP address
		  for (var i=1;i<=4;i++) {
		    if (IPArray[i]>255) {
			errMsg = "Destination IP address is invalid!";
			return false;
		    }
	    }
	    return true;
	}
	// Domain is symbolic name
	var domainArray=domain.match(domainPat);
	if (domainArray==null) {
		errMsg = "The domain name doesn't seem to be valid.";
	    return false;
	}
	var atomPat=new RegExp(atom,"g");
	var domArr=domain.match(atomPat);
	var len=domArr.length;
	if (domArr[domArr.length-1].length<2 ||
	    domArr[domArr.length-1].length>4) {
	   // the address must end in a two letter or three letter word.
	   errMsg = "The domain name doesn't seem to be valid.";
	   return false;
	}
	// Make sure there's a host name preceding the domain.
	if (len<2) {
	   errMsg ="This address is missing a hostname!";
	   return false;
	}
	// If we've gotten this far, everything's valid!
	return true;
}

function validate(f)
{
	var pass=true;
	errMsg = '';
	if(f.name.value=='' || f.email.value=='' || f.telefono.value=='' || f.custom_comments.value=='')
		alert("Por favor asegúrese de completar todos los campos requeridos.");
	else
	if(!EmailCheck(f.email.value))
		alert("Por favor ingrese una dirección de correo valida.");
	else
		return true;
	return false;
}