//将字符串从指定长度截断，在后面加上"..."，汉字为双字节
function cutString(originalString, strLength) {
	var currentLength = 0;
	var re1=/ /g;
	var re2=/&nbsp/g;
	var re3=/ /g;
	originalString = originalString.replace(re1," ");
	
	originalString = originalString.replace(re2," ");

	for (var i=0; i<=originalString.length; i++ ) {
		if (currentLength>strLength) {
			return originalString.substring(0,i-1)+"...";
		}
		var ch = originalString.charCodeAt(i);
		if (ch > 256) {
			currentLength++;
		}
		currentLength++;
	}
	
	originalString = originalString.replace(re3,"&nbsp;");
	
	return originalString;
}