Filter a list, elements

filter.js

$(function(){
	$('.filterField').keyup(function(){
	   var valThis = $(this).val().toLowerCase();
	    if(valThis == ""){
	    	$(wvstationsTree.jqId + " ul li").show();           
	    } else {
	    	$(wvstationsTree.jqId + " ul li").each(function(){
	            var text = $(this).text().toLowerCase();
	            (text.indexOf(valThis) >= 0) ? $(this).show() : $(this).hide();
	        });
	   };
	});
})