function validateEmail(value) {
if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(value)){
return value
} else {
alert('La direccion de email es incorrecta.');
return "";
}
}

function trim( str ) {
var resultStr = "";
resultStr = TrimLeft(str);
resultStr = TrimRight(resultStr);
return resultStr;
}

function TrimLeft( str ) {
var resultStr = "";
var i = len = 0;
if (str+"" == "undefined" || str == null)    
return "";
str += "";

if (str.length == 0) 
resultStr = "";
else {    
len = str.length;
while ((i <= len) && (str.charAt(i) == " "))
i++;
resultStr = str.substring(i, len);
}
return resultStr;
}

function TrimRight( str ) {
var resultStr = "";
var i = 0;
if (str+"" == "undefined" || str == null)    
return "";
str += "";
if (str.length == 0) 
resultStr = "";
else {
i = str.length - 1;
while ((i >= 0) && (str.charAt(i) == " "))
i--;
resultStr = str.substring(0, i + 1);
}

return resultStr; 
}

function validate(form){

if (trim(document.getElementById("Nombre").value) == "")
{ alert("Por favor, complete su nombre"); document.getElementById("Nombre").focus(); return; }

if (trim(document.getElementById("Telefono").value) == "")
{ alert("Por favor, complete su Telefono"); document.getElementById("Telefono").focus(); return; }


if (trim(document.getElementById("Email").value) == "")
{ alert("Por favor, complete su Email"); document.getElementById("Email").focus(); return; }

var mail = trim(document.getElementById("Email").value);
mail = validateEmail(trim(document.getElementById("Email").value));
document.getElementById("Email").value = mail;
if (mail == "")
{document.getElementById("Email").focus(); return; }


document.getElementById("contactform").submit();
}