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Код

this.insertTab = function (str1,str2){
        
        var select_area_id = 'cp';
        
        var textarea = document.getElementById(select_area_id);
        var st = textarea.scrollTop;
        var text, offset;
        var selection = document.selection || getSelection();
        
        var selStart = textarea.selectionStart; 
        var selEnd   = textarea.selectionEnd;
            text     = textarea.value;
            
        if(str2){
            
            textarea.value = text.substring(0, selStart) + str1 + text.substring(selStart, selEnd) + str2 + text.substring(selEnd, text.length);
            offset = str1.length;
            textarea.selectionStart = selStart + offset;
            textarea.selectionEnd   = selEnd   + offset;

        }
        else{

            textarea.value = text.substring(0, selStart) + str1  + text.substring(selEnd, text.length);
            offset = str1.length;
            textarea.selection = selStart ;
            textarea.selectionEnd   = selEnd   + offset;
            
        }
        textarea.scrollTop      = st;
        
        textarea.focus();
    }