function toggleLayer(whichLayer,forceVis) {

	var elem, vis, img, hr ;

	if( document.getElementById ) { 

		// this is the way the standards work

		elem = document.getElementById( whichLayer ) ;

		img = document.getElementById( whichLayer+'_img' ) ;

		hr = document.getElementById( whichLayer+'_hr' ) ;

	} else if( document.all ) { 

		// this is the way old msie versions work

		elem = document.all[whichLayer] ;

		img = document.all[whichLayer+'_img'] ;

		hr = document.all[whichLayer+'_hr'] ;

	} else if( document.layers ) { 

		// this is the way nn4 works

		elem = document.layers[whichLayer];

		img = document.layers[whichLayer+'_img'] ;

		hr = document.layers[whichLayer+'_hr'] ;

	}

	vis = elem.style ;

	

	if (vis.display==''||vis.display=='block'||forceVis==false) {

		vis.display = 'none' ;

	} else {

		vis.display = 'block';

	}

}



function flipVis(thisTarget,thisVis) {

	var elem, vis ;

	if( document.getElementById ) { 

		elem = document.getElementById( thisTarget ) ; // standard way

	} else if( document.all ) { 

		elem = document.all[thisTarget] ; // old msie

	} else if( document.layers ) { 

		elem = document.layers[thisTarget]; // nn4

	}

	vis = elem.style ;

	

	if (vis.display==''||vis.display=='block'||thisVis==false) {

		vis.display = 'none' ;

	} else {

		vis.display = 'block';

	}

}