function shWindow(gotourl, w, h) {
	//establish default values for optional parameters
	//if (typeof w == 'undefined') { 
	if (typeof w != 'number') { w=640; }
	if (typeof h != 'number') { h=480; }
	shwin = window.open(gotourl, 'shwindow', 'toolbar=no,location=no,status=no,menubar=no,scrollbars=no,resizable=yes,width='+ w +',height='+ h +'');
	if (shwin.innerWidth != w || shwin.innerHeight != h) { shwin.resizeTo(w,h); }
	shwin.focus();
}