function toggleLayer(whichLayer){
		
	if (document.getElementById) {
		// this is the way the standards work
		var style2 = document.getElementById(whichLayer).style;
		//if(style2.display == "block")
			style2.display = "none";
		//else
			//style2.display = "block";
	} else if (document.all) {
		// this is the way old msie versions work
		var style2 = document.all[whichLayer].style;
		//if(style2.display == "block")
			style2.display = "none";
		//else
			//style2.display = "block";
	} else if (document.layers) {
		// this is the way nn4 works
		var style2 = document.layers[whichLayer].style;
		//if(style2.display == "block")
			style2.display = "none";
		//else
			//style2.display = "block";

	}
}