function search_type() {

    var frm = document.forms[0];
    var obj = frm.elements['cat'];
    
    switch ( obj.selectedIndex ) {
    
        case 0:
        case 1:
        case 2:
        case 5:
        case 6:
        case 7:
        
            frm.elements['mistnosti'].style.display = 'block';
			frm.elements['mistnosti'].disabled = false;
            frm.elements['plocha'].style.display = 'none';
			frm.elements['plocha'].disabled = true;
            
            var el = document.getElementById('txtMistnosti');
            el.style.display = '';
            
            var el = document.getElementById('txtPlocha');
            el.style.display = 'none';
            
            break;
        
        default:
        
            frm.elements['mistnosti'].style.display = 'none';
			frm.elements['mistnosti'].disabled = true;
            frm.elements['plocha'].style.display = 'block';
			frm.elements['plocha'].disabled = false;
            
            var el = document.getElementById('txtMistnosti');
            el.style.display = 'none';
            
            var el = document.getElementById('txtPlocha');
            el.style.display = '';
            
    
    }

}

function kontrolaTyp() {
        
        var searchOptions = new Array( '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' );
        
        var el = document.forms[0].elements;
        var d  = el['cat'][el['cat'].selectedIndex].value;
        
        if( d >= 5 ) el['cat'].value = '5';
        
        el['cat'].value = searchOptions[d];
        
        if( d != 0 && d != 5 ) document.forms[0].submit();
        
            else alert('Vyberte prosím typ nemovitosti.\nChoose the type of property.\nВыберите тип недвижимости');
			return false;
    }