function Request(module, method, params, callback) {
	
	SuccessFunc = function(params) {
		
			if (params.refresh)
				document.location.reload();
						
			if (params.alert)
				alert(params.alert);
				
			if (params.error)
				alert(params.error);
			else
				callback(params);
				
	};

	if (typeof(Ajax) != "undefined") { //We have prototype
		new Ajax.Request('/!/'+module+'/'+method, {
			method:'post',
			postBody:'json='+encodeURIComponent(Object.toJSON(params)),
			onSuccess: function(transport) {			
				try {
					var json = transport.responseText.evalJSON();
					SuccessFunc(json);
				}
				catch (e) {
					if (transport.responseText && transport.responseText.length)
						return alert("Error occured while talking to server.\n"+transport.responseText + e.message);
				}
			}
		});
	}
	else if (typeof(jQuery) != "undefined") { //We have jQuery
		jQuery.post('/!/'+module+'/'+method, 
			{ json : encodeURIComponent($.toJSON(params)) },
			function(response) {
				try {
					var json = $.parseJSON(response);
					SuccessFunc(json);
				}
				catch (e) {
					if (transport.responseText && transport.responseText.length)
						return alert("Error occured while talking to server.\n"+transport.responseText);
				}
			}
		);
	}
	else {
		alert('Please install prototype.js or jQuery + http://jollytoad.googlepages.com/json.js (or rewrite Request() yourself)');
	}

}

function HSC(str) {
	return str.replace('&', '&amp;').replace('<', '&lt;').replace('>', '&gt;');
}