function contact( country ) {
	document.getElementById( 'tit-cz' ).className = '' ;
	document.getElementById( 'tit-sk' ).className = '' ;
	document.getElementById( 'bod-cz' ).className = 'hidden' ;
	document.getElementById( 'bod-sk' ).className = 'hidden' ;
	
	document.getElementById( 'tit-' + country ).className = 'active' ;
	document.getElementById( 'bod-' + country ).className = 'visible' ;
}

function precobj( id ) {
	if( id ) {
		document.getElementById( 'kgt[' + id + ']' ).innerHTML = document.getElementById( 'pc[' + id + ']' ).value * document.getElementById( 'kg[' + id + ']' ).innerHTML ;
		var kgt = 0 ;
		kgt = getElementsByName_iefix( 'span', 'kgt' ) ;
		var kg = 0 ;
		for ( i = 0; i < kgt.length; ++i ) {
			kg = kg + parseFloat( kgt[i].innerHTML ) ;
		}
		document.getElementById( 'celr' ).innerHTML = kg ;
	}
}

function getElementsByName_iefix(tag, name) {
    
    var elem = document.getElementsByTagName(tag);
    var arr = new Array();
    for(i = 0,iarr = 0; i < elem.length; i++) {
         att = elem[i].getAttribute("name");
         if(att == name) {
              arr[iarr] = elem[i];
              iarr++;
         }
    }
    return arr;
}