function openViewer(imgName){
var viewerURL = 'viewer.php?viewImg=' + imgName; 
var viewerWin = window.open(viewerURL,'winName','toolbar=no,location=no,resizable=no,menubar=no,scrollbars=no,status=no'); 
viewerWin.focus() ;
}

function setScreen( l,t,w,h )
{
window.resizeTo( w,h );
	if(window.viewerIsOpen == null)
	{
		window.moveTo( l,t );
	}
}

function hideDiv(divId) {
document.getElementById(divId).style.visibility = "hidden";
}