//this function sets the nav appearance
//if cat is present, set highlighting on cat section & expand section dropdowns



function setNav(cat,subcat){
	if(!(isNull(cat)) && cat!=''){
		//alert("cat is " + cat);
		$("#"+cat).addClass("current");
		$("#"+cat+"-subnav").show();
		
		//if subcat is present, also highlight subcat cat div
		if(!(isNull(subcat)) && subcat!=''){
			//alert("subcat is " + subcat);
			$("#"+cat+"-"+subcat).addClass("dropdownSelected");	
		}
	}
	//if neither cat nor subcat, select home div
	else{
		$("#Home").addClass("current");
	}	
}