var timerlen = 6;
var slideAniLen = 747;

var timerID = new Array();
var startTime = new Array();
var obj = new Array();
var endWidth = new Array();
var moving = new Array();
var dir = new Array();
var elements = new Array();


function setElement(objname){
    elements[elements.length] = objname;
}

function slidedown(objname){
        if(moving[objname])
                return;
        if(document.getElementById(objname).style.display != "none")
                return; // cannot slide down something that is already visible

        moving[objname] = true;
        dir[objname] = "down";
        startslide(objname);
}

function slideup(objname){
        if(moving[objname])
                return;

        if(document.getElementById(objname).style.display == "none")
                return; // cannot slide up something that is already hidden

        moving[objname] = true;
        dir[objname] = "up";
        startslide(objname);
}

function startslide(objname){
        obj[objname] = document.getElementById(objname);

        endWidth[objname] = parseInt(obj[objname].style.width);
        startTime[objname] = (new Date()).getTime();

        if(dir[objname] == "down"){
                obj[objname].style.width = "1px";
        }

        obj[objname].style.display = "block";

        timerID[objname] = setInterval('slidetick(\'' + objname + '\');',timerlen);
}

function slidetick(objname){
        var elapsed = (new Date()).getTime() - startTime[objname];

        if (elapsed > slideAniLen)
                endSlide(objname)
        else {
                var d =Math.round(elapsed / slideAniLen * endWidth[objname]);
                if(dir[objname] == "up")
                        d = endWidth[objname] - d;

                obj[objname].style.width = d + "px";
        }

        return;
}

function endSlide(objname){
        clearInterval(timerID[objname]);

        if(dir[objname] == "up")
                obj[objname].style.display = "none";

        obj[objname].style.width = endWidth[objname] + "px";

        delete(moving[objname]);
        delete(timerID[objname]);
        delete(startTime[objname]);
        delete(endWidth[objname]);
        delete(obj[objname]);
        delete(dir[objname]);

        return;
}

function slide(objname){
    if(moving[objname])
        return;
    if(document.getElementById(objname).style.display != "none"){
        dir[objname] = "up";
        var nomore = true;
        var i=0;
        while(i<elements.length){
            if(elements[i] != objname) 
                nomore = nomore && (document.getElementById(elements[i]).style.display == "none");
            i++;
        }
        if(nomore){
            slide('capa_default');
            document.getElementById(objname).style.display = "none";
            return;
        }
    }else{
        dir[objname] = "down";
        var i=0;
        while(i<elements.length){
            if(elements[i] != objname) document.getElementById(elements[i]).style.display = "none";
            i++;
        }
    }
    
    moving[objname] = true;
    startslide(objname);
    
    return;
}

function changeTab(objname){
    if(objname == 'tab_news'){
        obj = document.getElementById('tab_agenda');
        obj.style.display = 'none';
        obj = document.getElementById('tab_agenda_title');
        obj.style.background = '#FFFFFF';
        
        obj = document.getElementById('tab_news');
        obj.style.display = 'block';
        obj = document.getElementById('tab_news_title');
        obj.style.background = '#DDDDDD';
    }else{
        obj = document.getElementById('tab_news');
        obj.style.display = 'none';
        obj = document.getElementById('tab_news_title');
        obj.style.background = '#FFFFFF';
        
        obj = document.getElementById('tab_agenda');
        obj.style.display = 'block';
        obj = document.getElementById('tab_agenda_title');
        obj.style.background = '#DDDDDD';
    }
}

function changeTabTopic(objname){
    if(objname == 'tab_expert'){
        obj = document.getElementById('tab_interest');
        obj.style.display = 'none';
        obj = document.getElementById('tab_interest_title');
        obj.style.background = '#FFFFFF';
        
        obj = document.getElementById('tab_expert');
        obj.style.display = 'block';
        obj = document.getElementById('tab_expert_title');
        obj.style.background = '#DDDDDD';
    }else{
        obj = document.getElementById('tab_expert');
        obj.style.display = 'none';
        obj = document.getElementById('tab_expert_title');
        obj.style.background = '#FFFFFF';
        
        obj = document.getElementById('tab_interest');
        obj.style.display = 'block';
        obj = document.getElementById('tab_interest_title');
        obj.style.background = '#DDDDDD';
    }
}