function showimage(imgurl, mustshow) {
	var divObj = (document.getElementById) ? document.getElementById('divimage') : document.all['divimage'];
	var frameObj = (document.getElementById) ? document.getElementById('frameimage') : document.all['frameimage'];
	
	if (divObj && frameObj) {
		if (mustshow) {
			frameObj.src = "imageshow.php?imgurl="+imgurl;
		}else{
			frameObj.src = '';
			divObj.style.visibility = 'hidden';
		}
	}
}

function sizeDiv(width, height) {
	var divObj = (document.getElementById) ? document.getElementById('divimage') : document.all['divimage'];
	var bodywidth = getWidth('booktable');
	
	if (divObj) {
		divObj.style.height = height;
		divObj.style.width = width;
		divObj.style.left = (bodywidth - width) / 2;
		divObj.style.visibility = 'visible';
	}
}