window.onload=function(){
    var tabs=[
            document.getElementById('tab0'),
            document.getElementById('tab1'),
            document.getElementById('tab2'),
            document.getElementById('tab3'),
            document.getElementById('tab4')
        ],
        tabsep=[
            document.getElementById('tabsep0'),
            document.getElementById('tabsep1'),
            document.getElementById('tabsep2'),
            document.getElementById('tabsep3'),
            document.getElementById('tabsep4'),
            document.getElementById('tabsep5')
        ],
        content=[
            document.getElementById('tabcn0'),
            document.getElementById('tabcn1'),
            document.getElementById('tabcn2'),
            document.getElementById('tabcn3'),
            document.getElementById('tabcn4')
        ],
        selectTab=function(id){
            var i=tabs.length;
            while(i--){
                if(i==id){
                    tabsep[i].style.background="url(/images/tab_sep_L.gif)";
                    tabs[i].style.background="#ffffff";
                    tabs[i].style.cursor="default";
                    tabs[i].style.color="#f68b1f";
                    tabs[i].onmouseover=tabs[i].onmouseout=function(){}
                    tabsep[i+1].style.background="url(/images/tab_sep_R.gif)";
                    tabs[i].style.textDecoration="none";
                    show(content[i]);
                }else{
                    hide(content[i]);
                    tabs[i].style.background="#d5d5d5";
                    tabs[i].style.cursor="pointer";
                    tabs[i].style.color="#000000";
                    tabs[i].onmouseover=function(){this.style.textDecoration="underline"}
                    tabs[i].onmouseout=function(){this.style.textDecoration="none"}
                    if(i==0){
                        tabsep[i].style.background="#d5d5d5";
                    }else if(i+1==tabs.length){
                        tabsep[i+1].style.background="#d5d5d5";
                    }else{
                        tabsep[i].style.background="url(/images/tab_sep.gif)";
                        if(i+1!=id)tabsep[i+1].style.background="url(/images/tab_sep.gif)";
                    }
                }
            }
        },
        show=function(){},
        hide=show,
        d=document.createElement("DIV");

    // операции с видимостью
    if (typeof(d.visibility)=="undefined"){
        show = function(e){e.style.display=""}
        hide = function(e){e.style.display="none"}
    } else {
        show = function(e){e.visibility="visible"}
        hide = function(e){e.visibility="hidden"}
    }

    tabs[0].onmousedown=function(){selectTab(0)}
    tabs[1].onmousedown=function(){selectTab(1)}
    tabs[2].onmousedown=function(){selectTab(2)}
    tabs[3].onmousedown=function(){selectTab(3)}
    tabs[4].onmousedown=function(){selectTab(4)}

    selectTab(0);

}