window.onload=start;

	function start()
	{
	
	var imgs = document.getElementsByTagName('img');
	for(var i=0;i<imgs.length;i++)
	{
		if(imgs.item(i).className=='imgClosed')
		imgs.item(i).onclick=onimage;
	}
	}
	
	function onimage()
	{
	if(this.className!="imgOpen")
	{
		this.className="imgOpen";
		this.style['top']=document.documentElement.scrollTop+'px';
	}
	else
	{
		this.className="imgClosed";
	}
	}