var navi=document.getElementById("main_navi"),navp=navi.getElementsByTagName("li"),subNaviElements={},navcounter=0,insub=false;addLoadEvent(navi_init)
function navi_init(){for(var i=0;i<navp.length;i++){var subitem=navp[i].getElementsByTagName('ul');if(subitem.length==1){navcounter++;subNaviElements[navcounter]=subitem[0];subitem[0].id='subNavi_'+navcounter;navp[i].className='mainNavi';navp[i].id='mainli_'+navcounter;navp[i].onmouseover=function(){var navid=this.id.replace('mainli_','');insub=true;toggle_subnavi(navid)};navp[i].onmouseout=function(){toggle_subnavi(0)}}else navp[i].className='subNavi'}}
function toggle_subnavi(id){for(var i=1;i<=navcounter;i++){document.getElementById('subNavi_'+i).className='';document.getElementById('mainli_'+i).className=''};if(id!=0){document.getElementById('subNavi_'+id).className='akt';document.getElementById('mainli_'+id).className='akt'}};