function Realtime(elem){
	this.img_node = elem;
	this.src = elem.src;
	
	this.init();
}

Realtime.prototype.init = function(elem){
	var _me = this;
	this.proxy_image = new Image();
	
	this.proxy_image.onload = function(){
		_me.img_node.src = _me.proxy_image.src;
	}
	
	setInterval(
		function(){
			_me.proxy_image.src = _me.src + "?" + Math.random();
		}
		,60000
	);

}

$(function(){
	$('.realtime').find('img').each(function(){
		new Realtime(this);
	});
});