function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}


function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}


function showLayer(layer) {

	for (var i = 1; i < 14; i++) {
		document.getElementById('layer' + i).style.visibility = 'hidden';
	}
	
	if (layer > 0) {
		document.getElementById('layer' + layer).style.visibility = 'visible';
	}
	
}