function showLayer(layerName)  {  
	document.getElementById(layerName).style.display='block'; 
}

function hideLayer(layerName)  {  
	document.getElementById(layerName).style.display='none';  
}

function selectLayer(layerName)  {  
	//document.getElementById(layerName).style.backgroundColor= '#0066CC'; 
	document.getElementById(layerName).style.background = "background-image: url('images/grey1-translucent-bg.png')"; 
	document.getElementById(layerName).style.color = '#0066CC';
}

function disselectLayer(layerName)  {  
	//document.getElementById(layerName).style.backgroundColor= ''; 
	document.getElementById(layerName).style.background  = '';
	document.getElementById(layerName).style.color = '';
}

function popup(mylink, ww, wh, scrbar, resize) {
  if (! window.focus) return true; 
    var newwin; 
    var href;
    var winwidth = ww;
    var winheight = wh;
    var posX =(screen.width-winwidth)/2;
    var posY =(screen.height-winheight)/2;

    var setting = 'width='+winwidth+',';
    setting += 'height='+winheight+',';
    setting += 'top='+posY+',';
    setting += 'left='+posX+',';
    setting += 'scrollbars='+scrbar+',';
    setting += 'resizable='+resize+',';
    setting += 'alwayRasied=yes';
    
	if (typeof(mylink) == 'string'){
      href=mylink;
    } else {
      href=mylink.href;
    };
     newwin = window.open(href, 'NewWindow', setting);
     return false;
}