var elem = document.getElementsByTagName('DIV');
for(var i = 0; i < elem.length; i++)
{
if(elem[i].className == 'imgnavi')
{
elem[i].onmouseover = function(){this.className = "imgnaviover";};
elem[i].onmouseout = function(){this.className = "imgnavi";};
}
}


var elem = document.getElementsByTagName('DIV');
for(var i = 0; i < elem.length; i++)
{
if(elem[i].className == 'server')
{
elem[i].onmouseover = function(){this.className = "serverover";};
elem[i].onmouseout = function(){this.className = "server";};
}
}