function proz(){
    var textbox = document.getElementById("nr").value; / nr is editbox
    var div = document.getElementById("proz"); / proz is the transparent div

    if (document.getElementById("nr").value == "a"){ / i tried with if var == "a" but nothing.
        div.setAtribute("id", "proz2"); /here proz 2 is another pink div, trying to overlay first div
    }
}