myLogger.js

function myLogger(id){
	id = id || 'ADSLogWindow'
	var logWindow = null
	var createWindow = function(){
		var browserWindowSize = ADS.getBrowserWindowSize();
		var top = ((browserWindowSize.height - 200) / 2) || 0;
		var left = ((browserWindowSize.width - 200) / 2) || 0;

		logWindow = document.createElement('UL');

		logWindow.setAttribute('id', id);

		logWindow.style.position = 'absolute';
		logWindow.style.top = top + 'px';
		logWindow.style.left = left + 'px';

		logWindow.style.width = '200px';
		logWindow.style.height = '200px';
		logWindow.style.overflow = 'scroll';

		logWindow.style.padding = '0';
		logWindow.style.margin = '0';
		logWindow.style.border = '1px solid black';
		logWindow.style.blackground = 'white';
		logWindow.style.listStyle = 'none';
		logWindow.style.font = '10px/10px Verdana, Tahoma, Sans';

		document.body.appendChild(logWindow);

	}
	this.writeRaw = function(message){
		if(!logWindow) createWindow();

		var li = document.createElement('LI');
		li.style.padding = '2px';
		li.style.border = '0';
		li.style.borderBottom = '1px dotted black';
		li.style.margin = '0';
		li.style.color = '#000';
		li.style.font = '9px/9px Verdana, Tahoma, Sans';

		if(typeof message == 'undefined'){
			li.appendChild(document.createTextNode('Message was undefined'));
		}else if(typeof li.innerHTML != undefined){
			li.innerHTML = message;
		}else{
			li.appendChild(document.createTextNode(message));
		}

		logWindow.appendChild(li);

		return true;
	}
}

myLogger.prototype = {
	write: function(message){
		if(typeof message === 'string' && message.length === 0){
			return this.writeRaw('ADS.log: null message');
		}

		if(typeof message !== 'string'){
			if(message.toString) return this.writeRaw(message.toString());
			else return this.writeRaw(typeof message);
		}

		message = message.replace(/</g, "<").replace(/>/g, ">");

		return this.writeRaw(message);
	},
	header: function(message){
		message = '<span style="color:white; background:black; font-weight: bold; padding: 0px 5px;">'+message+'</span>';
		return this.writeRaw(message);
	}
}

if(!window.ADS){window['ADS'] = {};}
window['ADS']['log'] = new myLogger();