function replaceSelection() {            if (window.getSelection) {                var selecter = window.getSelection();                var selectStr = selecter.toString();                if (selectStr.trim != "") {                    var rang = selecter.getRangeAt(0);                    var temp = $("<b>" + selectStr + "<b/>");                    rang.surroundContents(temp[0]);                }            } else if (document.selection) {//ie                var selecter = document.selection.createRange();                selecter.select();                var selectStr = selecter.text;                selecter.pasteHTML("<b>" + selectStr + "<b/>");            }        }