function showHide(aDiv_name)
    {
            var aDiv = document.getElementById(aDiv_name);
            if(aDiv) {
                var shown = (aDiv.style.display == 'block');
                aDiv.style.display = shown ? 'none' : 'block';
            }
    }
function openWindow(theURL,winName,w,h) {

	LeftPosition = (screen.availWidth/2)-(w/2)
	TopPosition  = (screen.availHeight/2)-(h/2)
	features='width=' + w + ',height=' + h + ',left=' +  LeftPosition + ',top=' + TopPosition + ',scrollbars=yes' + ',menubar=yes'
	window.open(theURL,winName,features);

}