function ukryjpokaz(blok) {
 if((!document.all && document.getElementById && document.getElementById(blok).style.display != "block") || (document.all && document.all[blok].style.display != "block")) {pokaz(blok)}
 else {ukryj(blok)};
};

function ukryj(blok) {
 if(document.all) {document.all[blok].style.display = "none"};
 if(!document.all && document.getElementById) {document.getElementById(blok).style.display = "none"};
 if(document.layers) {};
};

function pokaz(blok) {
 if(document.all) {document.all[blok].style.display = "block"};
 if(!document.all && document.getElementById) {document.getElementById(blok).style.display = "block"};
 if(document.layers) {};
};

function start() {
 ukryj('koment2');
}