function doPopup(filename,w,h,title,caption) {
	if(isNaN(w)) {
		w = 640;
	}
	else {
		w = w;
	}
	if(isNaN(h)) {
		h = 600;
	}
	else {
		h = h;
	}

	var userW = screen.width;
	var userH = screen.height;
	if (h > userH) {
		h = userH - (userH * 0.15);
	}
	if (w > userW) {
		w = userW - (userW * 0.15);
	}

	popupWin=window.open('popup.php?c='+filename+'&t='+title+'&caption='+caption,'sidebarWin','directories=no, fullscreen=no, height='+h+', left=0, location=no, menubar=no, resizable=yes, scrollbars=yes, status=no, titlebar=no, top=0, width='+w);
	popupWin.focus();
}