// JavaScript Document

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function MM_openBrWindow(theURL,winName,features) { //v2.0
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/* based on the interest calculator on an early version of the javascript documentation and the formula posted to the flyfish
 listserver in July of 1994... */
function checkNumber(input, min, max, msg)
{msg = msg + " field has invalid data: " + input.value;
var str = input.value;
for (var i = 0; i < str.length; i++) {
var ch = str.substring(i, i + 1)
if ((ch < "0" || "9" < ch) && ch != '.') {
alert(msg);
return false;
}
}
var num = 0 + str
if (num < min || max < num) {
alert(msg + " not in range [" + min + ".." + max + "]");
return false;
}
input.value = str;
return true;
}
function computeField(input)
{
if (input.value != null && input.value.length != 0)
input.value = "" + eval(input.value);
computeForm(input.form);
}
function computeForm(form)
{
if (form.fishlength.value == null || form.fishlength.value.length == 0)

return;
// calculate default for girth if not entered...
if (form.fishgirth.value == null || form.fishgirth.value.length == 0)
{
form.fishgirth.value = form.fishlength.value * .58;
}
if (!checkNumber(form.fishlength, 1, 120, "Length in inches") ||
!checkNumber(form.fishgirth, 1, 100, "Girth in inches"))
{
form.fishweight.value = "Invalid";
return;
}
// a bass/trout has r = 800, a pike/musky has r = 900
r = 800;

var girth2 = form.fishgirth.value;
girth2 *= girth2;
//
// the formula for weight of a fish posted to Flyfish@ by Gerry Barbe on 7/13/94
//   is Weight=Length * (Girth ** 2) / (shape factor)
//   where shape factor = 800 for bass/trout or 900 for cylindrical fish
//   like pike/musky
//
form.fishweight.value = (form.fishlength.value * girth2) / r;
}
function clearForm(form)
{
form.fishlength.value = "";
form.fishgirth.value = "";
form.fishweight.value = "";
}