function addimage(){  
	var str = prompt("输入图片的超链接(例如,http://www.skykiwi.co.nz/images/index/logo.jpg):","http:\/\/");
	if ((str != null) && (str != "http://")){
		str = trim(str);
		form1.des.innerText+="\n[url="+str+"][img]"+str+"[/img][/url]";  
	}	
	else 
		form1.des.focus();
}
function addURL(){  
	var str = prompt("请输入链接(例如,http://www.skykiwi.co.nz):","http:\/\/");
	if ((str != null) && (str != "http://")){
		var str1 = prompt("请输入显示内容:","");
		if(str1 == "") str1 = "点击这里";
		form1.des.innerText+="\n[url="+trim(str)+"]"+trim(str1)+"[/url]";  		
	}	
	else 
		form1.des.focus();
}
function trim(sString){
	while (sString.substring(0,1) == ' '){
		sString = sString.substring(1, sString.length);
	}
	while (sString.substring(sString.length-1, sString.length) == ' '){
		sString = sString.substring(0,sString.length-1);
	}
	return sString;
}
function leftTrim(sString){
	while (sString.substring(0,1) == ' '){
		sString = sString.substring(1, sString.length);
	}
	return sString;
}
function rightTrim(sString){
	while (sString.substring(sString.length-1, sString.length) == ' '){
		sString = sString.substring(0,sString.length-1);
	}
	return sString;
}