var textarea = document.getElementById('share');
    var iStart = 0;
    var iLength = $("#share").val().length;

    if (textarea.createTextRange)
    {
        var oRange = textarea.createTextRange();
        oRange.moveStart("character", iStart);
        oRange.moveEnd("character", iLength);
        oRange.select();

    } else if (textarea.setSelectionRange)
    {
        textarea.setSelectionRange(iStart, iLength);
    }k