@DatinMa. Yes I do care about all form fields, I made a function here, but is this the best way to do something like this?
http://jsfiddle.net/hc8kL/35/
Code:
function checktext() {
if($("#f1").val().length > 0 && $("#f2").val().length > 0 && $("#f3").val().length > 0) {
$('#stage1').removeAttr('disabled');}
else {document.getElementById("stage1").disabled = true;}
}