select_text.function.js

function select_text(element) {
    var start = 0;
    var end   = element.value.length;

    if (element.createTextRange) {
        var selRange = element.createTextRange();
        selRange.collapse(true);
        selRange.moveStart('character', start);
        selRange.moveEnd('character', end - start);
        selRange.select();
    }
    else if (element.setSelectionRange) {
        element.setSelectionRange(start, end);
    }
    else if (element.selectionStart) {
        element.selectionStart = start;
        element.selectionEnd = end;
    }
}