function DownloadAerology() {  
reg = document.moscow.region5.value;
zabl = document.moscow.zabl5.value; 
prefix="https://method.meteorf.ru/ansambl/aerology/"; 
typefile=".png";	
var url = prefix + reg + zabl + typefile ;   
document.dimg1.src = url;
document.getElementById("meteo").style.display="none"; }