var tabnum;
function setTabs(num)
{
    tabnum = num;    
}
function SelectTab(tab)
{ 
    for (i = 1; i <= tabnum; i++)
    {
        subtab = 'tab'+i+'_1';
        var theTab = document.getElementById(subtab);         
        if (theTab.className == "tab1")
        { 
        changeTab('tab'+i);
        }
    }
    changeTab(tab);
}
function changeTab(tab)
{
    for (i = 1; i <= 3; i++)
    {
        ctab = tab;           
        ctab = ctab +"_"+ i;
        var theTab = document.getElementById(ctab);         
        if (theTab.className == "tab"+ i +"_o")
        { 
            theTab.className = "tab"+ i; 
        }else{   
            theTab.className = "tab"+ i +"_o";   
        }
    }    
}
function visibleTabs(tabId)
{
    var theTab = document.getElementById('tab'+tabId);
    theTab.style.visibility="hidden";
    
}
function invisibleTabs(tabId)
{
    var theTab = document.getElementById('tab'+tabId);
    theTab.style.display="";
}