function toggleLayer( whichLayer )
{
	var elem, vis;
	if( document.getElementById ) // this is the way the standards work
		elem = document.getElementById( whichLayer );
	else if( document.all ) // this is the way old msie versions work
		elem = document.all[whichLayer];
	else if( document.layers ) // this is the way nn4 works
		elem = document.layers[whichLayer];
	vis = elem.style;
	// if the style.display value is blank we try to figure it out here
	if( vis.display == '' && elem.offsetWidth != undefined && elem.offsetHeight != undefined )
		vis.display = ( elem.offsetWidth != 0 && elem.offsetHeight != 0 ) ? 'block':'none';
	vis.display = ( vis.display == '' || vis.display == 'block' ) ? 'none':'block';
}

function setHandler( tagType, clsName, eventType, func )
{
	elements = document.getElementsByTagName( tagType );
	for( var t = 0; t < elements.length; t++ )
	{
		if( elements[t].className.indexOf( clsName ) >= 0 )
		{
			var code = "elements[t]." + eventType + " = " + func;
			eval( code );
		}
	}
}


function initpage( )
{
	setHandler( 'tr', 'toggle', 'onclick', 'toggleColor' );
	setHandler( 'span', 'heading', 'onmouseover', 'toggleColor' );
	setHandler( 'span', 'heading', 'onmouseout', 'toggleColor' );
}
if( top.location != self.location )
		top.location = self.location;
window.onload = initpage;