// universal for all pages
  // TODO: preload imgs
	DOM = (document.getElementById) ? 1 : 0;
	function hide(ctrl){
		if(DOM && document.getElementById(ctrl)) document.getElementById(ctrl).style.display = 'none';
	}
	function show(ctrl){
		if(DOM && document.getElementById(ctrl)) document.getElementById(ctrl).style.display = 'block';
	}
	function hideAll() {
  	hide('navigation_1_1');
  	hide('navigation_1_2');
  	hide('navigation_1_3');
  	hide('navigation_1_4');
  	hide('navigation_1_5');
  	hide('navigation_1_1_1');
  	hide('navigation_1_1_2');
  	hide('navigation_1_1_3');
  	hide('navigation_1_1_4');
  	hide('navigation_1_1_5');
  	hide('navigation_1_2_1');
  	hide('navigation_1_2_2');
  	hide('navigation_1_2_3');
  	hide('navigation_1_2_4');
  	hide('navigation_1_2_5');
  	hide('navigation_1_3_1');
  	hide('navigation_1_3_2');
  	hide('navigation_1_3_3');
  	hide('navigation_1_3_4');
  	hide('navigation_1_3_5');
  	hide('navigation_1_4_1');
  	hide('navigation_1_4_2');
  	hide('navigation_1_4_3');
  	hide('navigation_1_4_4');
  	hide('navigation_1_4_5');
  	hide('navigation_1_5_1');
  	hide('navigation_1_5_2');
  	hide('navigation_1_5_3');
  	hide('navigation_1_5_4');
  	hide('navigation_1_5_5');
	}
	function preLoad(){
	  new Image(200,220).src = 'obr/menu_podklad_05.gif';
	  new Image(200,220).src = 'obr/menu_podklad_06.jpg';

	}


    <!--


    function CryptMailto()
    {
        var n = 0;
        var r = "";
        var s = "mailto:"+document.forms[0].emailField.value;
        var e = document.forms[0].emailField.value;

        e = e.replace( /@/, " [at] ");
        e = e.replace( /\./g, " [dot] ");

        for( var i=0; i < s.length; i++ )
        {
            n = s.charCodeAt( i );
            if( n >= 8364 )
            {
                n = 128;
            }
            r += String.fromCharCode(n+1);
        }
        document.forms[0].cyptedEmailField.value = r;
        document.forms[0].HTMLCyptedEmailField.value = "<a href=\"javascript:linkTo_UnCryptMailto('"+ r +"');\">"+ e +"</a>";
    }

    function UnCryptMailto( s )
    {
        var n = 0;
        var r = "";
        for( var i = 0; i < s.length; i++)
        {
            n = s.charCodeAt( i );
            if( n >= 8364 )
            {
                n = 128;
            }
            r += String.fromCharCode( n - 1 );
        }
        return r;
    }

    function linkTo_UnCryptMailto( s )
    {
        location.href=UnCryptMailto( s );
    }
    // -->


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

function zobrazprod(){
idecko = "oddil" + Formular.druh_produkce.value; 
el=document.getElementById(idecko).style; 

for (i=1; i <= 2; i++) {
document.getElementById('oddil' + i).style.display='none'
 }
 
el.display=(el.display == 'block')?'none':'block';
}