if(navigator.userAgent.indexOf("Firefox") != -1)
        {
        //Bu netspace ,firefox, opera üçün *****************************************
        //Taglar üçün bold, italic, underline v.s
            function format_1(t,x,y) {
                if (t.setSelectionRange) {
                t.value = t.value.substring(0,t.selectionStart) + x + t.value.substring(t.selectionStart,t.selectionEnd) + y + t.value.substring(t.selectionEnd,t.value.length);
                }
            }        
        }
        // Buda internet explorer üçün *****************************************
        else if(navigator.userAgent.indexOf("MSIE") != -1)
        {
            //Taglar üçün bold, italic, underline v.s
            function format_1 (t,x,y) { 
            var secilen = document.selection.createRange().text; 
                if (secilen != "")  { 
                var secilenmetin = "" + x + "" + secilen + "" + y;
                document.selection.createRange().text = secilenmetin; 
                } 
            }
        }