function showDesc(descId){
	var mainDiv = document.getElementById('main');
	var descDiv = document.getElementById('desc');
	var thisDiv = document.getElementById(descId);
	mainDiv.style.display = 'none';
	descDiv.style.display = 'block';
	descDiv.innerHTML = '<a href="javascript:hideDesc();" id="close">close <img src="close.png" border="0"></a>' + thisDiv.innerHTML;
}
function hideDesc(){
	var mainDiv = document.getElementById('main');
	var descDiv = document.getElementById('desc');
	descDiv.style.display = 'none';
	mainDiv.style.display = 'block';
	descDiv.innerHTML = '';
}