//class is in
var dwProgressBar = new Class({
	
	//implements
	Implements: [Options],

	//options
	options: {
		container: $$('body')[0],
		boxID:'',
		percentageID:'',
		displayID:'',
		startPercentage: 0,
		displayText: false,
		speed:10
	},
	
	//initialization
	initialize: function(options) {
		//set options
		this.setOptions(options);
		//create elements
		this.createElements();
	},
	
	//creates the box and percentage elements
	createElements: function() {
		var box = new Element('div', { id:this.options.boxID });
		var perc = new Element('div', { id:this.options.percentageID, 'style':'width:0px;' });
		perc.inject(box);
		box.inject(this.options.container);
		if(this.options.displayText) { 
			var text = new Element('div', { id:this.options.displayID });
			text.inject(this.options.container);
		}
		this.set(this.options.startPercentage);
	},
	
	//calculates width in pixels from percentage
	calculate: function(percentage) {
		return ($(this.options.boxID).getStyle('width').replace('px','') * (percentage / 100)).toInt();
	},
	
	//animates the change in percentage
	animate: function(to) {
		$(this.options.percentageID).set('morph', { duration: this.options.speed, link:'cancel' }).morph({width:this.calculate(to.toInt())});
		if(this.options.displayText) { 
			$(this.options.displayID).set('text', to.toInt() + '%'); 
		}
	},
	
	//sets the percentage from its current state to desired percentage
	set: function(to) {
		this.animate(to);
	}
	
});