function showTab(tabNum){
    resetTabs();
    if (document.getElementById('t'+tabNum).className != "active"){
        document.getElementById('t'+tabNum).className = "active";
        document.getElementById('t'+tabNum+'_content').className = "tabcontentlive";
    }
    else {
        document.getElementById('t'+tabNum).className = "block";
        document.getElementById('t'+tabNum+'_content').className = "tabcontenthide";
    }
}
function resetTabs(){
    for(i=1;i<=8;i++){
        if(document.getElementById('t'+i) != null)
            document.getElementById('t'+i).className = "block";
        if(document.getElementById('t'+i+'_content') != null)
            document.getElementById('t'+i+'_content').className = "tabcontenthide";
    }
}