Hide/Show DIV based on Form Field

All,
I am trying to hide a div on the View if a form fields value is "".
I tried using the following in the View page/JavaScript OnLoad event:
if (document.getElementById("view1_txtDeployCPType00").value == "")

{

document.getElementById("Initial").style.display = "none";
else

document.getElementById("Initial").style.display ="block";

}

1. "view1_txtDeployCPType00" is the span id that is present when rendered. The form field is txtDeployCPType00.
   
2. "Initial" is the DIV I am wishing to manipulate.
   Anyone have any suggestions what I am doing wrong?
   Many thanks,
   Scott