/**
* Reference: Sandeep V. Tamhankar (stamhankar@hotmail.com),
* http://javascript.internet.com
*/
function isEmailAddress(cadena)
{
	var s = cadena;
	var filter=/^[A-Za-z][A-Za-z0-9_.]*@[A-Za-z0-9_]+\.[A-Za-z0-9_.]+[A-za-z]$/;
	if (s.length == 0 ) 
		return true;
	if (filter.test(s))
		return true;
	else
		return false;
}


function trim(s) {
	return s.replace( /^\s*/, "" ).replace( /\s*$/, "" );
}