m1 = new Image;
m1.src = "buttons/1_off.jpg";
m1o = new Image;
m1o.src = "buttons/1_on.jpg";
m2 = new Image;
m2.src = "buttons/2_off.jpg";
m2o = new Image;
m2o.src = "buttons/2_on.jpg";
m3 = new Image;
m3.src = "buttons/3_off.jpg";
m3o = new Image;
m3o.src = "buttons/3_on.jpg";
m4 = new Image;
m4.src = "buttons/4_off.jpg";
m4o = new Image;
m4o.src = "buttons/4_on.jpg";
m5 = new Image;
m5.src = "buttons/5_off.jpg";
m5o = new Image;
m5o.src = "buttons/5_on.jpg";
m6 = new Image;
m6.src = "buttons/6_off.jpg";
m6o = new Image;
m6o.src = "buttons/6_on.jpg";

function navMouseOver(imgid,imgnew) {
    document.images[imgid].src=eval(imgnew + ".src");    
}

function showdiv(div) {
    obj = document.getElementById(div);
	obj.style.display = 'block';
}
function hidediv(div) {
	obj = document.getElementById(div);
	obj.style.display = 'none';
}

function update_form() {
	try{
	with (document.objednavka) {
		if (bus_type.value=="1") {			
			showdiv('voziky_ano');
            hidediv('voziky_ne');			
		}
		else if (bus_type.value=="2") {			
			showdiv('voziky_ano');
			hidediv('voziky_ne');
		}
		else if (bus_type.value=="3") {			
			showdiv('voziky_ne');
			hidediv('voziky_ano');
		}
		else if (bus_type.value=="4") {			
			showdiv('voziky_ne');
            hidediv('voziky_ano');			
		}
		else  {			
			showdiv('voziky_ne');
            hidediv('voziky_ano');			
		}
	}
	} catch(err) { }
}