function previsioni_italia(){
if (document.select.select1.options[document.select.select1.selectedIndex].value != "none") {
	url = "http://italian.wunderground.com/global/stations/" + document.select.select1.options[document.select.select1.selectedIndex].value + ".html"
        openlarge(url,'previsioni')
 }
}
function previsioni_europa(){
if (document.select.select2.options[document.select.select2.selectedIndex].value != "none") {
	url = "http://italian.wunderground.com/global/stations/" + document.select.select2.options[document.select.select2.selectedIndex].value + ".html"
        openlarge(url,'previsioni')
 }
}
function previsioni_mondo(){
if (document.select.select3.options[document.select.select3.selectedIndex].value != "none") {
	url = document.select.select3.options[document.select.select3.selectedIndex].value
        openlarge(url,'previsioni')
 }
}