var currentLayer = 'null';
function extend (layer) {
	summary = layer + 'sum';
	layerLink = layer + 'Link';
	if (currentLayer!='null') {
		currentSum = currentLayer + 'sum';
		currentLink = currentLayer + 'Link';
		document.getElementById(currentSum).style.display = 'none';
		document.getElementById(layer).className = 'article';
		document.getElementById(currentLayer).style.backgroundColor = 'transparent';
		document.getElementById(currentLink).className = 'headingLink';
	}	
	document.getElementById(summary).style.display = 'block';
	document.getElementById(layer).className = 'articleActive';
	document.getElementById(layer).style.backgroundColor = '#000000';
	document.getElementById(layerLink).className = 'headingLinkActive';
	document.getElementById(layer).blur();
	
	for (i=0;i<5;i++) {	
	linkHref = 'article'+i+'Link';
		if (checker[i]==layer) {
			document.getElementById(linkHref).href = newLink[i];
		}	
		if (checker[i]==currentLayer) {
			document.getElementById(linkHref).href = "javascript:extend('"+currentLayer+"');";
		}	
	}
	
	/*var newSummary, newLink; 
	newSummary = newSummary + '<a class=moreLink href="'+newLink+'"><b>MORE ></b></a>';
	document.getElementById(summary).innerHTML = newSummary; */	
		
	currentLayer = layer;
}