function signature(obj) {
	if(obj.style.maxHeightIE != '') {
		var height = (obj.scrollHeight > parseInt(obj.style.maxHeightIE)) ? obj.style.maxHeightIE : obj.scrollHeight;
		if(obj.innerHTML.indexOf('<IMG ') == -1) {
			obj.style.maxHeightIE = '';
		}
		return height;
	}
}

function setcopy(text, alertmsg){
	if(is_ie) {
		clipboardData.setData('Text', text);
		alert(alertmsg);
	} else {
		prompt('Please press "Ctrl+C" to copy this text', text);
	}
}

function notice_att(){
	alert('请不要使用右键另存下载附件,请直接左键点击附件弹出附件下载框!');
}