var NavCatSelected=new Object();
var NavProcessing=new Object();

function navBlind(itemClicked){
	cat=itemClicked.name;
	selectedid=itemClicked.id;
	showDiv=selectedid+'_div';

	if(!NavProcessing[cat] && NavCatSelected[cat]!==selectedid){
		NavProcessing[cat]=1;
		elements=document.getElementsByTagName('a');

		for(var i = 0; i < elements.length; i++){ 
			if(elements[i].name==cat){
				
				linkid=elements[i].id;
		
				hidediv=document.getElementById(linkid+'_div');
				if(linkid && hidediv && hidediv.style.display=='block'){
					document.getElementById(linkid).checked=false;
					new Effect.BlindUp(hidediv, {duration:.5, queue: 'end' });
				}
			}
		}
		document.getElementById(selectedid).checked=true;
		new Effect.BlindDown(showDiv, {duration:.5, queue: 'end', afterFinish: function(){ NavProcessing[cat]=0; } });
		NavCatSelected[cat]=selectedid;
	}
}