function CreateAjax () {
	objetoXml = false;
 
	if ( window.XMLHttpRequest ) {
    	try {
        	objetoXml = new XMLHttpRequest ();
		} catch ( e ) {
        	objetoXml = false;
		} 
	} else if ( window.ActiveXObject ) {
    	try {
        	objetoXml = new ActiveXObject ( "Msxml2.XMLHTTP" );
		} catch ( e ) {
        	try {
            	objetoXml = new ActiveXObject ( "Microsoft.XMLHTTP" );
			} catch ( e ) {
            	objetoXml = false;
			} 
		}
	}               
	return objetoXml
}