[UnrealEd]

you can place all the attach fields in an array:

Code:

attach = new array(number_of_fields);
attach[0] = "window.opener.document.foo.attach1.value";
attach[1] = "window.opener.document.foo.attach2.value";
attach[2] = "etc";
for(var i=0; i<number_of_fields; i++){
  eval(attach[i]+" = "+document..filesform.userFile[i].value);
}

don't know if there's an eval function in javascript, but i think there is. Try this and post back,
UnrealEd