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

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