SCRIPT5007: Unable to get property 'value' of undefined or null reference -

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Javascript

Hi
We are getting the following error on line 5 of the following script;

Uanble to get property 'value' of undefined or null reference

function initPart() {
	if (!(prepop)) {
		//loadActivities();
		//loadSecLevels();
		loadValues("seclevel", "getseclevels.asp?sl=" + document.getElementById("selSecLevel").value);
		loadCaveats();
		loadLookup("Priority", "ROUTINE");
		loadLookup("Releasability", "");
		}
}

function validateCreate() {
  var classuri = document.getElementById("classuri");
  if (classuri.value == 0) {
    showError("Error - This field is mandatory and must be completed - Activity");
    return false;
  }
}

My knowledge of Javascript is minimal so any help would be great.

Thanks

Matt Hunter