function zobrazSkryj(idecko){
	el=document.getElementById(idecko).style;
	el.display=(el.display == 'block')?'none':'block';
}

function zmenaPoctu(url){
	if(document.getElementById('barva')) str = "&barva="+document.getElementById('barva').value;
	else str = "";
	if(document.getElementById('velikost')) str2 = "&velikost="+document.getElementById('velikost').value;
	else str2 ="";
	document.location = url+"?pocet="+document.getElementById('pocet').value+str+str2;
}