copyhint = true;
function clipboardcopy(val) {
	if (window && window.clipboardData) {
		// msie
		return window.clipboardData.setData('text', val);
	}

	if (netscape && netscape.security) {
		// request access to XPCOM api
		try {
			netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
		}
		catch(e) {
			if (copyhint)
				alert('Cannot access clipboard.\nSet boolean signed.applets.codebase_principal_support in about:config');
			copyhint = false;
			return false;
		}

		// use nsIClipboard interface
		try {
			Components.classes['@mozilla.org/widget/clipboardhelper;1']
				.getService(Components.interfaces.nsIClipboardHelper)
				.copyString(val);
			return true;
		}
		catch(e) {
			alert('Copy failed');
			return false;
		}
	}
}

charmatch = /^U\+([0-9A-F]{4,})/;
function copycellchars() {
	var unicode = charmatch.exec(this.title);
	var str = String.fromCharCode(parseInt(unicode[1], 16));
	return clipboardcopy(str);
}

var cells = document.getElementsByTagName('TD');
for (var i = 0; i < cells.length; i++) {
	if (!cells[i].title) continue;
	if (!charmatch.test(cells[i].title)) continue;
	cells[i].onclick = copycellchars;
}