function $() {
	var elements = new Array();
	for (var i=0;i<arguments.length;i++) {
		var element = arguments[i];
		if (typeof element == 'string') element = document.getElementById(element);
		if (arguments.length == 1) return element;
		elements.push(element);
	}
	return elements;
}

var BoxHeights = {
     values: Array(),
	actualValues: Array(),
	boxes: Array(),
	num: 0,
	op_test: false,
	
	
	equalise: function() {
		this.num = arguments.length;
		for (var i=0;i<this.num;i++) if (!$(arguments[i])) return;
		this.boxes = arguments;
		//this.maxheight();
		this.getMax(arguments);

		//console.log('inits' + this.values)
		//console.log('actuals' + this.actualValues)

		maxinit = this.max(this.values)
		maxactual = this.max(this.actualValues)

		if (maxinit.id=='center') {
			$(this.boxes[0]).style.height = maxactual.value + "px";
			$(this.boxes[1]).style.height = maxactual.value+ "px";			
		} else if (maxinit.id=='left') {
			if (maxinit.value > this.actualValues[2]) {
				$(this.boxes[0]).style.height = maxinit.value+"px";
				$(this.boxes[1]).style.height = maxinit.value+"px";		
			} else {
				$(this.boxes[0]).style.height = this.actualValues[2]+"px";
				$(this.boxes[1]).style.height = this.actualValues[2]+"px";		
			}
		} else if (maxinit.id=='right') {
					if (maxinit.value > this.actualValues[2]) {
				$(this.boxes[0]).style.height = maxinit.value+"px";
				$(this.boxes[1]).style.height = maxinit.value+"px";		
			} else {
				$(this.boxes[0]).style.height = this.actualValues[2]+"px";
				$(this.boxes[1]).style.height = this.actualValues[2]+"px";		
			}
		}
		/*for (var i=0;i<this.num;i++) {
			if(arguments[i]!='center') {
				$(arguments[i]).style.height = this.maxh+"px";
			}
		}*/
	}, 
	initMax:function(){
		this.num = arguments.length;
		for (var i=0;i<this.num;i++) if (!$(arguments[i])) return;
		this.boxes = arguments;
		var heights = new Array();	
		for (var i=0;i<this.num;i++) {
			if (navigator.userAgent.toLowerCase().indexOf('opera') == -1) {
				this.values.push($(this.boxes[i]).scrollHeight);
				heights.push($(this.boxes[i]).scrollHeight);
			} else {
				this.values.push($(this.boxes[i]).offsetHeight);
				heights.push($(this.boxes[i]).offsetHeight);
			}
		}
	},
	
	getMax:function(){
		var heights = new Array();
		this.actualValues = new Array();
		for (var i=0;i<this.num;i++) {
			if (navigator.userAgent.toLowerCase().indexOf('opera') == -1) {
				this.actualValues.push($(this.boxes[i]).scrollHeight);
				heights.push($(this.boxes[i]).scrollHeight);
			} else {
				this.actualValues.push($(this.boxes[i]).offsetHeight);
				heights.push($(this.boxes[i]).offsetHeight);
			}
		}
	},
	
	max: function(vals){
		var heights = new Array();	
		for (var i=0;i<this.num;i++) {
			heights.push(vals[i])
		}
		heights.sort(this.sortNumeric);
		for (var i=0;i<this.num;i++) {
			if (vals[i] == heights[this.num-1]){
				return {id: this.boxes[i], value:vals[i]};
			}
		}
		return {id:'', value:0}
	}, 
	
/*	maxheight: function() {
		var heights = new Array();
		var preheights = new Array();
		for (var i=0;i<this.num;i++) {
			if (navigator.userAgent.toLowerCase().indexOf('opera') == -1) {
				heights.push($(this.boxes[i]).scrollHeight);
			} else {
				heights.push($(this.boxes[i]).offsetHeight);
			}
			preheights.push(heights[i])
		}
		heights.sort(this.sortNumeric);
		//preheights.sort(this.sortNumeric);
		maxIniziale = heights[this.num-1];
		console.log('iniziale=>' +'left='+preheights[0]+'; right='+preheights[1] +'; center='+preheights[2]+ '    ' + 'attuale=>' +' 0='+heights[0]+'; 1='+heights[1] +'; 2='+heights[2]+ '    ' + 'maxIniziale=' + maxIniziale)
		
		if ($('center').offsetHeight < $('left').offsetHeight){
			this.maxh= $('center').offsetHeight
			console.log(this.maxh)
		}else {
			this.maxh= maxIniziale;
		}
	},*/
	sortNumeric: function(f,s) {
		return f-s;
	}
}
 
window.onload = function() {
	BoxHeights.initMax('left','right','center');
	BoxHeights.equalise('left','right','center');
}

window.onresize = function(){
	BoxHeights.equalise('left','right','center');
}