function graf(){
    var n = document.form1.nome.value;
    var f = document.form1.fetta.value;
    var c = document.form1.colore.value;
    var t = document.form1.titolo.value;
    var tc= document.form1.tc.value;
    var d = document.form1.dimensione.value;
    var st = document.form1.st.value;
    var sf = document.form1.sfondo.value;
if (n=="") n=("nomi mancanti!");
if (f=="") f=("100");
if (c=="") c=("0000FF");
if (t=="") t=("nessun titolo!");
if (tc=="") tc=("000000");
if (d=="") d=("580x290");
if (sf=="") sf=("FFFFFF");
 var add=("<img src=\"http://chart.apis.google.com/chart?cht="+st+"&chd=t:"+f+"&chs="+d+"&chf=bg,s,"+sf+"&chl="+n+"&chco="+c+"&chtt="+t+"&chts="+tc+"\" border=\"1\">");
                 document.getElementById("graf").innerHTML=add; 
                 document.form1.t3.value= ("http://chart.apis.google.com/chart?cht="+st+"&chd=t:"+f+"&chs="+d+"&chf=bg,s,"+sf+"&chl="+n+"&chco="+c+"&chtt="+t+"&chts="+tc+"");
}