// JavaScript Document
function toggle(lnk, wstate) {
	
	if (typeof lnk == 'string') {	
			var url = document.getElementById(lnk).src;
			var lead = url.substr(0, url.lastIndexOf('.') - 1);
			if (typeof wstate == 'undefined') {
				var state = url.substr(url.lastIndexOf('.') - 1, 1);
				state = parseInt(Math.abs(parseInt(state) - 1));
			} else {
				var state = wstate;
			}
			var ext = url.substr(url.lastIndexOf('.'));
			if (/\d+/.test(state)) { document.getElementById(lnk).src = lead + state + ext; }
	}
}