/**
 * gup - get url parameter
 *
 * Retorna o valor da variavel name do url
 */
function gup( name, url ) {
	if( !url ) url = window.location.href;
	name = name.replace( /[\[]/, "\\\[" ).replace( /[\]]/, "\\\]" );
	var results = new RegExp("[\\?&]"+name+"=([^&#]*)").exec(url);

	if( results == null ) return null;
	else // decodeURIComponent doesn't recognize + as encoding for space
		return decodeURIComponent(results[1].replace(/\+/g," ")); 
}