function is_ie() {
	return ( /msie/i.test(navigator.userAgent) && !/opera/i.test(navigator.userAgent) );
};

function trim(cadena) {
	return cadena.replace(/^\s+|\s+$|^\n+|\n+$/g,"");
};

function popUp(theURL,winName,features) { 
  window.open(theURL,winName,features);
	return false;  
}