function toggleLayer(whichLayer) 
{
	var elem, vis;
	if(document.getElementById) // this is the way the standards work
		elem = document.getElementById(whichLayer);
	else if(document.all) // this is the way old msie versions work
		elem = document.all[whichLayer];
	else if(document.layers) // this is the way nn4 works
		elem = document.layers[whichLayer];
	vis = elem.style;

	if(vis.display==''&&elem.offsetWidth!=undefined&&elem.offsetHeight!=undefined)
		vis.display = (elem.offsetWidth!=0&&elem.offsetHeight!=0)?'block':'none';
		vis.display = (vis.display==''||vis.display=='block')?'none':'block';
}

function init()
{
toggleLayer('modulo1');
toggleLayer('modulo2');
toggleLayer('modulo3');
toggleLayer('modulo4');
toggleLayer('modulo5');
toggleLayer('modulo6');
toggleLayer('modulo7');
}
window.onload=init;