ASP.NET

public static Control GetControlByID(string id, Control ctl)
    {
        Control retCotl;
        for (int i = 0; i < ctl.Controls.Count; i++)
        {
            retCotl = ctl.Controls[i].FindControl(id);
            if (retCotl != null)
            {
                return retCotl;
            }
            else
            {
                retCotl = GetControlByID(id, ctl.Controls[i]);
                if (retCotl != null)
                {
                    return retCotl;
                }
            }
        }
        return null;
    }

var n="";
str=document.getElementById("attach").value;
m=str.lastIndexOf("\\");
m++; //Increment the position of the last \\ so it is not included in the variable n.

n = str.substr(m, str.length-m);
document.getElementById("name").innerHTML = n;

alert(document.getElementById("name").innerHTML);

var s = "hello";

alert(s[0]);