function mostra_nascondi() {
	
	var obj = document.getElementById('d' + this.id.replace(/\D/,''));
		
	if(obj.style.display=='block') {
		obj.style.display='none';
	} else {
		obj.style.display='block';
	}
}

function elenca() {
		
	var software = document.getElementById('download').getElementsByTagName('dt');
		
	for(var k=0;k<software.length;k++) {
		software[k].onclick = mostra_nascondi;
	}
}
	
window.onload = elenca;