function toggleLayer( whichLayer,whatButton ) {
	var elem,button,vis,vis2;
	if( document.getElementById ) {// this is the way the standards work
	elem = document.getElementById( whichLayer );
	button = document.getElementById( whatButton );}
	else if( document.all ) {// this is the way old msie versions work
	elem = document.all[whichLayer];
	button = document.all[whatButton];}
	else if( document.layers ) { // this is the way nn4 works
	elem = document.layers[whichLayer];
	button = document.layers[whatButton];}
	
	vis = elem.style;
	vis2 = button.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';
		
		vis2.backgroundPosition = (vis2.backgroundPosition=='0'||vis2.backgroundPosition=='0px -17px')?'':'0px -17px';
		//alert(vis2.backgroundPosition);
		//vis2.backgroundPosition = '0 -17px;';
}