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reg_exp = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,6})+$/
//regular expression to test if the entered e-mail address is valid

for(i=0;i<f.elements.length-3;i++)
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if(f.elements[0].checked == false && f.elements[1].checked == false && f.elements[2].checked == false && f.elements[3].checked == false && f.elements[4].checked == false && f.elements[5].checked == false && f.elements[6].checked == false && f.elements[7].checked == false && d.getElementById("other").value == "") 
{
alert("You didn't indicate why you are documenting this sighting (question #1).");
f.elements[0].focus();
return false;
}

if(d.getElementById("species").value.length < 4)
{
alert("You didn't say what species you're documenting (question #2).");
d.getElementById("species").focus();
return false;
}

if(d.getElementById("number").value.length < 1)
{
alert("You didn't indicate how many birds there were (question #3).");
d.getElementById("number").focus();
return false;
}

if(d.getElementById("age_sex_plumage").value.length  < 4)
{
alert("You didn't say what age, sex, or plumage this bird is (question #4).");
d.getElementById("age_sex_plumage").focus();
return false;
}

if(d.getElementById("date").value.length < 4)
{
alert("You didn't include a date for this sighting (question #5).");
d.getElementById("date").focus();
return false;
}

if(d.getElementById("location").value.length < 4)
{
alert("You didn't give a location for this sighting (question #6).");
d.getElementById("location").focus();
return false;
}

if(d.getElementById("observers").value.length < 4)
{
alert("You didn't say who the observers were (question #7).");
d.getElementById("observers").focus();
return false;
}

if(d.getElementById("your_name").value.length < 8)
{
alert("You didn't include your name (question #8).");
d.getElementById("your_name").focus();
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}

if(d.getElementById("mailing_address").value.length < 8)
{
alert("You didn't include your mailing address (question #9).");
d.getElementById("mailing_address").focus();
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}

if(!reg_exp.test(d.getElementById("email_address").value))
{
alert("Not a valid e-mail address (question #10).");
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}

if(d.getElementById("others_agreeing").value.length < 4)
{
alert("You didn't indicate who agreed with the identification (question #11).");
d.getElementById("others_agreeing").focus();
return false;
}

if(d.getElementById("others_not_agreeing").value.length < 4)
{
alert("You didn't say who didn't agree with the identification (question #12).");
d.getElementById("others_not_agreeing").focus();
return false;
}

if(d.getElementById("description").value.length < 8)
{
alert("You didn't include a description (question #13).");
d.getElementById("description").focus();
return false;
}

if(d.getElementById("behavior").value.length < 8)
{
alert("You didn't include a description of the behaviour (question #14).");
d.getElementById("behavior").focus();
return false;
}

if(d.getElementById("vocalizations").value.length < 4)
{
alert("You didn't include a description of the vocalization, if heard (question #15).");
d.getElementById("vocalizations").focus();
return false;
}

if(d.getElementById("habitat").value.length < 8)
{
alert("You didn't include a description of the habitat (question #16).");
d.getElementById("habitat").focus();
return false;
}

if(d.getElementById("optical_equipment").value.length < 8)
{
alert("You didn't say what kind of optical equipment was used (question #17).");
d.getElementById("optical_equipment").focus();
return false;
}

if(d.getElementById("distance").value.length < 4)
{
alert("You didn't give a distance for this sighting (question #18).");
d.getElementById("distance").focus();
return false;
}

if(d.getElementById("time_of_observation").value.length < 4)
{
alert("You didn't give a time for this sighting (question #19).");
d.getElementById("time_of_observation").focus();
return false;
}

if(d.getElementById("total_time_of_observation").value.length < 4)
{
alert("You didn't give a total time of observation (question #20).");
d.getElementById("total_time_of_observation").focus();
return false;
}

if(d.getElementById("weather_conditions").value.length < 4)
{
alert("You didn't describe the weather for this sighting (question #21).");
d.getElementById("weather_conditions").focus();
return false;
}

if(d.getElementById("experience").value.length < 4)
{
alert("You didn't indicate what your experience is with " + "\n" + "this species and similar species (question #22).");
d.getElementById("experience").focus();
return false;
}

if(d.getElementById("similar_species").value.length < 8)
{
alert("You didn't eliminate similar species (question #23).");
d.getElementById("similar_species").focus();
return false;
}

if(!f.photos[0].checked  && !f.photos[1].checked)
//make sure a checkbox is checked
{
alert("You didn't say if photos were taken (question #24).");
f.photos[0].focus();
return false;
}

if(f.photos[0].checked  && d.getElementById("photographer").value.length < 4)
//make sure that if the "yes" checkbox is checked a name is also given
{
alert("You said photos were taken but " + "\n" + "you didn't say by whom (question #25).");
d.getElementById("photographer").focus();
return false;
}

if(d.getElementById("books_advice").value.length < 4)
{
alert("You didn't say what books were consulted or " + "\n"  +  "what advice was received, if any (question #26).");
d.getElementById("books_advice").focus();
return false;
}

if(d.getElementById("field_notes").value.length < 4)
{
alert("You didn't say how long after the sighting field notes were recorded (question #27).");
d.getElementById("field_notes").focus();
return false;
}

if(d.getElementById("duration").value.length < 4)
{
alert("You didn't say how long after the sighting this form was completed (question #28).");
d.getElementById("duration").focus();
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}

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