function dom_remove_element (parrent,child) {
    var p = document.getElementById(parrent);
    var ch = document.getElementById(child);
    p.removeChild(ch);
}

//nacte elementy podle name
//hodnoty elemntu bude davat za sebe oddeleny znakem ~  napr. a~b~c~d kde a,b,c,d jsou hodnoty elemntu
//vystupem je pak retezec napr.: a~b~c~d
function create_par_by_elemet_name (tag_name) {
    var str = '';
    var a = document.getElementsByName(tag_name);
    if (a.length == 0) str = '';
    else {
        for (i=0; i<a.length; i++) {
            if (i == 0) str = a[i].value;
            else str = str + '~' + a[i].value;
        }
    }
    return str;
}

//zjisti jestli pomoci udalosti onKeyPress byl stisknut enter
function is_enter_pressed(evt) {
    // Firefox, Opera 8.0+, Safari
    try {
        evt = evt || window.event;
        if (evt.keyCode == 13) {
            /*document.form1.action_type.value = "";
            document.form1.submit(); */
            //alert('ff');
            return true;
        }
    }
    //internet explorer
    catch (e) {
        if (window.event.keyCode == 13) {
            /*document.form1.action_type.value = typ;
            document.form1.submit(); */
            //alert('ie');
            return true;
        }
    }
    return false;
}