/**
 * switchVisible
 * @param {string} visid 
 */
 function switchVisible(visid) {
	
	//get all of the collections 
	var cols = document.getElementById("collections").childNodes;
	
	//clear the visibility of all of the collections
 	for(var i=0; i<cols.length; i++) {
 		var col = cols[i];
 		if (col.nodeName == "div" || col.nodeName == "DIV"){
 			col.style.display = 'none';
 		}
 	}
 	//set visibility of selected collection to block
 	document.getElementById(visid).style.display = 'block';
 	
 }