Url=new Array(5);
Url[0]="http://www.ulvac.net/ulvac/dxfmail1/";
Url[1]="http://www.ulvac.net/ulvac/dxfmail2/";
Url[2]="http://www.ulvac.net/ulvac/dxfmail3/";
function Jump_win(){
Jumpurl=Math.floor(3*Math.random());
window.open(Url[Jumpurl],"","width=590,height=450,scrollbars=yes,resizable=yes");
}