function align()
{var elem=document.getElementById('centrado');var container=document.getElementById('fondo');if(elem&&container)
{var containerHeight;var containerWidth;var elemHeight;var elemWidth;var y;var x;containerHeight=container.offsetHeight;containerWidth=container.offsetWidth;elemHeight=elem.offsetHeight;elemWidth=elem.offsetWidth;y=Math.ceil((containerHeight-elemHeight)/2);x=Math.ceil((containerWidth-elemWidth)/2);if(y<0)
{y=0;}
if(x<0)
{x=0;}
elem.style.position='relative';elem.style.top=y+'px';}}
function addevent(obj,evt,fn,capt){if(obj.addEventListener)
{obj.addEventListener(evt,fn,capt);return true;}
else if(obj.attachEvent)
{obj.attachEvent('on'+evt,fn);return true;}
else return false;}
addevent(window,'load',align,false);addevent(window,'resize',align,false);