function enter()
{
        var name_comp = window.document.getElementById('name_comp');
        var city = window.document.getElementById('city');
        var contakt = window.document.getElementById('contakt');
        var fone = window.document.getElementById('fone');
        var fax = window.document.getElementById('fax');
        var target = window.document.getElementById('target');
        var srok = window.document.getElementById('srok');
        var check = 0;
        var go_sub = window.document.getElementById('sub_but');

        if (name_comp.value == "") { check = 1; }
        if (city.value == "") { check = 1; }
        if (contakt.value == "") { check = 1; }
        if (fone.value == "") { check = 1; }
        if (fax.value == "") { check = 1; }
        if (target.value == "") { check = 1; }
        if (srok.value == "") { check = 1; }

        if (check == 1)
        {
                go_sub.disabled = true;
        } else {
                go_sub.disabled = false;
               }
        return true;
}

function enter3()
{
        var name_comp = window.document.getElementById('name_comp');
        var city = window.document.getElementById('city');
        var contakt = window.document.getElementById('contakt');
        var fone = window.document.getElementById('fone');
        var fax = window.document.getElementById('fax');
        var srok = window.document.getElementById('srok');
        var check = 0;
        var go_sub = window.document.getElementById('sub_but');

        if (name_comp.value == "") { check = 1; }
        if (city.value == "") { check = 1; }
        if (contakt.value == "") { check = 1; }
        if (fone.value == "") { check = 1; }
        if (fax.value == "") { check = 1; }
        if (srok.value == "") { check = 1; }

        if (check == 1)
        {
                go_sub.disabled = true;
        } else {
                go_sub.disabled = false;
               }
        return true;
}