var topmain_current = 1;
var topmain_total   = 3;
function edumainbox(num){
    
    $("#edumainbox"+topmain_current).css("display","none");
    $("#atoptab_"+topmain_current).attr("class","atag");
    $("#edumainbox"+num).css("display","block");
    $("#atoptab_"+num).attr("class","current");
    topmain_current = num;
    
}