Clear the fields on the page when it's loaded:
Put this code at the top of your pages...
<HTML>
<META Http-Equiv='Cache-Control' Content='no-cache'>
<META Http-Equiv='Pragma' Content='no-cache'>
<META Http-Equiv='Expires' Content='0'>
<HEAD>
<script LANGUAGE="JavaScript">
<!-- hide from old browsers
function formReset(){
for(a = 0; a < document.forms.length -1; a++){
for(i = 2; i < document.forms[a].elements.length -1; i++){
var inType = document.forms[a].elements[i].type;
if(inType == "text"){
document.forms[a].elements[i].value = "";
}
else if(inType == "select-one"){
document.forms[a].elements[i].options[0].selected = true;
}
else if(inType == "radio"){
document.forms[a].elements[i].checked = false;
}
else if(inType == "checkbox"){
document.forms[a].elements[i].checked = false;
}
}
}
}
//-->
</script>
</head>
<body onLoad="formReset()">
Then the rest of you page...