for (i=0;i++;i<=4)
{
var str = "pic"+i ;
var str1 =document.form1.all(str).value;
//或
//var str1 =eval("document.form1."+str).value;alert (str1);
}
{
var str = "pic"+i ;
var str1 =document.form1.all(str).value;
//或
//var str1 =eval("document.form1."+str).value;alert (str1);
}
{
var str = "pic"+i ;
var str1 =eval("document.form1."+str+".value;")
alert (str1);
}