function doc() {

 if (document.getElementsByTagName)
 {

var anchors = document.getElementsByTagName("p"); 
	 for (var i=0; i<anchors.length; i++) { 
		var anchor = anchors[i]; 
		
		if(anchor.className == "summary")
		{
anchor.style.display = (anchor.style.display != 'none' ? 'none' : 'block' );		
		}

 }
}
}