// Don't allow site to be framed
if (top.frames.length!=0) {
	// break frames if directly referencing tfl.gov.uk
	// work around for link checking
	if(location.href.search(/ltmuseum.co.uk/gi)!=-1){
	top.location=self.document.location;
	}
}

// add functions to the current onload stack
function addLoadEvent(func) {
    var oldonload = window.onload;
    if (typeof window.onload != 'function') {
        window.onload = func;
    } else {
        window.onload = function() {
            if (oldonload) {
                oldonload();
            }
            func();
        }
    }
}

var tflpageid=NaN;

// highlighter function
	function highlightLocalNavigation() {
		if (isNaN(tflpageid))
		{
			return;
		}
		else
		{
			element=document.getElementById('tflpageid-'+tflpageid);
			if (element)
			{
				element.className="current-page";
			}
		}
	}

	addLoadEvent(highlightLocalNavigation);