function rshr_check_ajax_available() {

	// internet explorer
	var platform = window.navigator.platform.toLowerCase();
	if ((document.all) && (platform.indexOf('mac') == -1)) {

		// try IE 7
		try {
			var tmp = new XMLHttpRequest();
			return 1;
		}
		catch(e) {

			// IE 6
			try {
				var tmp = new ActiveXObject("Microsoft.XMLHTTP");
				return 1;
			}
			catch(e) {
				return 0;
			}
		}
	}
	return 1;

} // end rshr_check_ajax_available