function hideall(block, fclass, tagName)
{
 var f=document.getElementById(block);
 var x=f.getElementsByTagName(tagName);
 var i;
 for (i = 0; i < x.length; i++)
    {
     if (checkisinclasslist(x[i], fclass)) x[i].style.display = "none";
    }
}

function unhide(blockid)
{
 var x = document.getElementById(blockid);
 x.style.display = "block";
 return false;
}

function hidecontent(blockid)
{
 hideall("content-main", "hiddencontent", "div");
 return false;
}
function showcontent(blockid)
{
 hidecontent();
 unhide(blockid);
 return false;
}