function checkData () {
error_0.innerHTML = "<p>&nbsp;</p>";
error_1.innerHTML = "<p>&nbsp;</p>"; error_2.innerHTML = "<p>&nbsp;</p>"; error_6.innerHTML = "<p>&nbsp;</p>";

// PERSONAL DETAILS
var firstname = document.form.ui_firstname.value;
var lastname = document.form.ui_lastname.value;
var sex = "";
if (document.form.ui_sex[0].checked) { var sex = "Y";}
if (document.form.ui_sex[1].checked) { var sex = "N";}
var age = document.form.ui_age.value;
var email = document.form.ui_email.value;
// QUALIFICATIONS
var qual = document.form.ui_qual.value;
var uni = document.form.ui_uni.value;
var qual_y = document.form.ui_qual_year.value;
var qual_c = document.form.ui_qual_country.value;
var qual_p = document.form.ui_qual_pst.value;
// FINAL QUESTIONS
var rate = "";
if (document.form.ui_rate[0].checked) { var rate = "1";}
if (document.form.ui_rate[1].checked) { var rate = "2";}
if (document.form.ui_rate[2].checked) { var rate = "3";}
if (document.form.ui_rate[3].checked) { var rate = "4";}
if (document.form.ui_rate[4].checked) { var rate = "5";}
if (document.form.ui_rate[5].checked) { var rate = "6";}
if (document.form.ui_rate[6].checked) { var rate = "7";}
if (document.form.ui_rate[7].checked) { var rate = "8";}
if (document.form.ui_rate[8].checked) { var rate = "9";}
if (document.form.ui_rate[9].checked) { var rate = "10";}
var abroad = "";
if (document.form.ui_abroad[0].checked) { var abroad = "Y";}
if (document.form.ui_abroad[1].checked) { var abroad = "N";}
var contact = "";
if (document.form.ui_contact[0].checked) { var contact= "Y";}
if (document.form.ui_contact[1].checked) { var contact = "N";}
var comments = document.form.ui_comments.value;
var valid = true;
// CHECK VARIABLES
if (firstname == "") {
	error_0.innerHTML = "<p>Please answer all questions. Thank you.</p>";
	error_1.innerHTML = "<p>Please enter your first name.</p>";
	document.form.ui_firstname.focus();	valid = false;
	} else 
if (lastname == "") {
	error_0.innerHTML = "<p>Please answer all questions. Thank you.</p>";
	error_1.innerHTML = "<p>Please enter your last name.</p>";
	document.form.ui_lastname.focus(); valid = false;
	} else
if (sex == "") {
	error_0.innerHTML = "<p>Please answer all questions. Thank you.</p>";
	error_1.innerHTML = "<p>Please indicate your sex.</p>";
	valid = false;
	} else
if (age == "") {
	error_0.innerHTML = "<p>Please answer all questions. Thank you.</p>";
	error_1.innerHTML = "<p>Please enter your age.</p>";
	document.form.ui_age.focus(); valid = false;
	} else	
if (email == "") {
	error_0.innerHTML = "<p>Please answer all questions. Thank you.</p>";
	error_1.innerHTML = "<p>Please enter your email address.</p>";
	document.form.ui_email.focus(); valid = false;
	} else	
if (qual == "") {
	error_0.innerHTML = "<p>Please answer all questions. Thank you.</p>";
	error_2.innerHTML = "<p>Please enter your qualifications.</p>";
	document.form.ui_qual.focus(); valid = false;
	} else
if (uni == "") {
	error_0.innerHTML = "<p>Please answer all questions. Thank you.</p>";
	error_2.innerHTML = "<p>Please enter your univeristy.</p>";
	document.form.ui_uni.focus(); valid = false;
	} else
if (qual_y == "") {
	error_0.innerHTML = "<p>Please answer all questions. Thank you.</p>";
	error_2.innerHTML = "<p>Please enter your year of qualification.</p>";
	document.form.ui_qual_year.focus(); valid = false;
	} else
if (qual_c == "") {
	error_0.innerHTML = "<p>Please answer all questions. Thank you.</p>";
	error_2.innerHTML = "<p>Please enter the country you qualified in.</p>";
	document.form.ui_qual_country.focus(); valid = false;
	} else
if (qual_p == "") {
	error_0.innerHTML = "<p>Please answer all questions. Thank you.</p>";
	error_2.innerHTML = "<p>Please enter any post grad qualifications.</p>";
	document.form.ui_qual_pst.focus(); valid = false;
	} else
if (rate == "") {
	error_0.innerHTML = "<p>Please answer all questions. Thank you.</p>";
	error_6.innerHTML = "<p>How seriously are you considering leaving medicine?</p>";
	valid = false;
	} else
if (abroad == "") {
	error_0.innerHTML = "<p>Please answer all questions. Thank you.</p>";
	error_6.innerHTML = "<p>Please tell us if you consider working abroad</p>";
	valid = false;
	} else
if (contact == "") {
	error_0.innerHTML = "<p>Please answer all questions. Thank you.</p>";
	error_6.innerHTML = "<p>Please let us know if we may contact you.</p>";
	valid = false;
	} 
	
return valid;
}