function showIt(id, how){
    if (navigator.appName == 'Microsoft Internet Explorer') {
        element=document.getElementById(id).style;
        element.display = 'block';
    }
    else {
        element=document.getElementById(id).style;
        element.display = how;
    }
}
// ......................................................................
function hideIt(id){
    element=document.getElementById(id).style;
    element.display = 'none';
}
function clean() {

	if(isDefault) {
		sBox.value="";
		isDefault=false;
		}

	}
function unclean() {

	if(!isDefault && sBox.value=="") {
		sBox.value="Zadejte klíčová slova";
		isDefault=true;
		}

	}