//navigation javascript

function toggleNav(nav,subnav,subnavsel){
	// hide all sub menus and display elem submenu
	$("#subnav ul").each(function(i) {
		 $(this).hide();
	});

	//clear all selected sub menus
	removeSubSelected();

	//display correct sub menu
	if(subnav)
		$("#" + subnav).css("display","block");

	//remove background graphics for all nav elements
	$("#nav a").each(function(i) {
		 $(this).css("background","");
	});

	//set background for new nav menu item
	if(nav)
		$("#nav a." + nav).css("background","url(/images/tab-" + nav + ".gif) bottom center no-repeat");

	//set sub menu to selected
	if(subnavsel){
		 $("#" + subnavsel).attr("id",'sub-selected');
		// if(subnavsel=='contacts')
		// 	 $("#" + subnavsel).css("width",'15em');
		// if(subnavsel=='docs')
		// 	 $("#" + subnavsel).css("width",'13em');
	}
}

function removeSubSelected(){
	$("#subnav ul li a").each( function(i) {
		if($(this).attr("class")=='selected'){
			$(this).removeClass("selected");
			$(this).css("color","#FFFFFF");
		 }
	});
}

$(document).ready(function() {
	//mouse over colour change
	$("#subnav ul li a").mouseover( function() {
		 if($(this).attr("id")!='sub-selected')
			$(this).css("color","#003867");
	});

	//mouse out - revert colour
	$("#subnav ul li a").mouseout( function() {
		 if($(this).attr("id")!='sub-selected'){
			$(this).css("color","#FFFFFF");
		 }
	});

	//when one is clicked, clear existing selection
	//and change clicked item to selected colour
	//$("#subnav ul li a").click( function(j) {
	//	 removeSubSelected();
	//	  $(this).addClass("selected");
	//	 $(this).css("color","#003867");
	//});


});