function displayDiv(showDiv)
{
    var myDivs = new Array('padova','rovigo','verona','vicenza','venezia','treviso','belluno');
	i = 0;
    while(i<myDivs.length)
    {
        //hide all
        document.getElementById(myDivs[i]).style.display = 'none';
		i++;
    }
    //show desired
    document.getElementById(showDiv).style.display = 'block';
}