_getSurveyForm = function ( nSurveyId ) {
	
	var oField = document.getElementById( "surveyId_" + nSurveyId );
	if( oField ) {
		return oField.form;
	} else {
		return null;
	}
	
}

_getQuestionPrompt = function ( nSurveyId, nQuestionId ) {
	
	
	var oElement = document.getElementById( "questionPrompt_" + nSurveyId + "_" + nQuestionId );
	if( oElement ) {
		return oElement.innerHTML;
	} else {
		return null;
	}
	
};


_setQuestionHighlight = function ( nSurveyId, nQuestionId, bHighlight ) {
	
	var oDiv = document.getElementById( "surveyQuestion_" + nSurveyId + "_" + nQuestionId );
	if( oDiv ) {

		if( bHighlight ) {
			YAHOO.util.Dom.addClass( oDiv, "highlighted" );
		} else {
			YAHOO.util.Dom.removeClass( oDiv, "highlighted" );
		}
		
	}
	
}

_questions = function( nSurveyId ) {
	
	var oForm = _getSurveyForm( nSurveyId );
	return oForm.elements.questionId.value.split( "," );
	
};

_questionsWithoutResponses = function ( nSurveyId ) {
	
	var oForm = _getSurveyForm( nSurveyId );
	
	// var aQuestionId = oForm.elements.questionId.value.split( "," );
	var aQuestionId = _questions( nSurveyId );
	var aQuestionsWithoutResponses = [];	
	
	for( var x = 0; x < aQuestionId.length; x++ ) {

		var nQuestionId = aQuestionId[x];
		var bHasResponse = false;
		
		var aChoiceId = oForm.elements[ "ChoiceIDList_" + nQuestionId ].value.split( "," );
		for( var y = 0; y < aChoiceId.length; y++ ) {
			var nChoiceId = aChoiceId[y];
			
			// this is by id instead of by name because the radio buttons all share the same name
			var oChoice = document.getElementById( "Choice_" + nQuestionId + "_" + nChoiceId );
			if( oChoice && oChoice.checked ) {
				bHasResponse = true;
				break;
			}
		}
		
		if( ! bHasResponse ) {
			// add it to the list of questions without a response 
			aQuestionsWithoutResponses[aQuestionsWithoutResponses.length] = nQuestionId;
		}
		
	}
	
	return aQuestionsWithoutResponses;
	
};


var _enableFreeForm = function( oCheckable ) {
	
	var sId = oCheckable.getAttribute( "id" );
	var aParts = sId.split( "_" );
	aParts[0] = "FreeForm";
	var sFreeFormId = aParts.join( "_" );
	var oFreeForm = document.getElementById( sFreeFormId );

	if( oFreeForm ) {

		if( oCheckable.checked ) {
			oFreeForm.setAttribute( "fse:required", "true" );
			oFreeForm.disabled = false;
		} else {
			oFreeForm.removeAttribute( "fse:required" );
			oFreeForm.disabled = true;
		}
	}
	
};

var _choiceClicked = function( oCheckable ) {

	if( oCheckable.type == "radio" ) {

		var aFieldParts = oCheckable.getAttribute("id").split( "_" );
		var sField = aFieldParts[0] + "_" + aFieldParts[1];
		
		var oForm = oCheckable.form;
		
		if( oForm.elements[sField].length ) {

			// more than 1
			
			for( var f = 0; f < oForm.elements[sField].length; f++ ) {
				
				oField = oForm.elements[sField][f];
				_enableFreeForm( oField );

				/*
				var sId = oField.getAttribute( "id" );
				var aParts = sId.split( "_" );
				aParts[0] = "FreeForm";
				var sFreeFormId = aParts.join( "_" );
				var oFreeForm = document.getElementById( sFreeFormId );

				if( oFreeForm ) {
					if( oField.checked ) {
						oFreeForm.setAttribute( "fse:required", "true" );
						oFreeForm.disabled = false;
					} else {
						oFreeForm.removeAttribute( "fse:required" );
						oFreeForm.disabled = true;
					}
				}
				*/
				
			}

			
		} else {
			
			// only 1
			
			_enableFreeForm( oCheckable );
			
			/*
			var sId = oCheckable.getAttribute( "id" );
			var aParts = sId.split( "_" );
			aParts[0] = "FreeForm";
			var sFreeFormId = aParts.join( "_" );
			var oFreeForm = document.getElementById( sFreeFormId );
			
			if( oFreeForm ) {
				if( oCheckable.checked ) {
					oFreeForm.setAttribute( "fse:required", "true" );
					oFreeForm.disabled = false;
				} else {
					oFreeForm.removeAttribute( "fse:required" );
					oFreeForm.disabled = true;
				}
			}
			*/

		}
		
		
	}
	else if ( oCheckable.type == "select-one" ){

		var oSelectable = oCheckable;

		var sId = oCheckable.getAttribute( "id" ).replace("Select_","Choice_");
		var oCheckable = document.getElementById( sId );

		// Check corresponding Checkbox
		if ( oSelectable.options[oSelectable.selectedIndex].value == "Y" ){
			oCheckable.checked = true;
		}
		else{
			oCheckable.checked = false;
		}

		// checkboxes
		_enableFreeForm( oCheckable );

		var aParts = sId.split( "_" );
		var nQuestionId = aParts[1];
		var nChoiceId = aParts[2];
			
		var sLinkedChoiceId = oCheckable.getAttribute( "fse:linkedChoiceId" );
		if( sLinkedChoiceId != null ) {
			
			var aChoiceId = sLinkedChoiceId.split( "," );
			for( var c = 0; c < aChoiceId.length; c++ ) {
				
				var nLinkedChoiceId = aChoiceId[c];
				
				var bInverse = false;
				if( nLinkedChoiceId < 0 ) {
					bInverse = true;
					nLinkedChoiceId = nLinkedChoiceId * -1;
				}

				if ( oSelectable.options[oSelectable.selectedIndex].value == "Y" ){
					oCheckable.checked = true;
					_checked = true;
				}
				else{
					oCheckable.checked = false;
					_checked = false;
				}
				
				if( nLinkedChoiceId != nChoiceId ) {
					oChoice = document.getElementById( "Choice_" + nQuestionId + "_" + nLinkedChoiceId );	
					oSelect = document.getElementById( "Select_" + nQuestionId + "_" + nLinkedChoiceId );	


					if( bInverse ) {
						oChoice.checked = ! _checked;
						if ( ! _checked ) {
							oSelectable.value = "N";
							if ( oSelect != null)
								oSelect.value = "Y";
						}
						else {
							oSelectable.value = "Y";
							if ( oSelect != null)
								oSelect.value = "N";
						}
					} else {
						oChoice.checked = _checked;
						if ( _checked ) {
							oSelectable.value = "Y";
							if ( oSelect != null)
								oSelect.value = "N";
						}
						else {
							oSelectable.value = "N";
							if ( oSelect != null)
								oSelect.value = "Y";
						}
					}
					_enableFreeForm( oChoice );
				}
			}
			
		}

	}
	else {

		// checkboxes
		_enableFreeForm( oCheckable );
		
		/*
		var sId = oCheckable.getAttribute( "id" );
		var aParts = sId.split( "_" );
		var nQuestionId = aParts[1];
		var nChoiceId = aParts[2];
		
		aParts[0] = "FreeForm";
		var sFreeFormId = aParts.join( "_" );
		var oFreeForm = document.getElementById( sFreeFormId );
		
		if( oFreeForm ) {
			if( oCheckable.checked ) {
				oFreeForm.setAttribute( "fse:required", "true" );
				oFreeForm.disabled = false;
			} else {
				oFreeForm.removeAttribute( "fse:required" );
				oFreeForm.disabled = true;
			}
		}
		*/

		var sId = oCheckable.getAttribute( "id" );
		var aParts = sId.split( "_" );
		var nQuestionId = aParts[1];
		var nChoiceId = aParts[2];
			
		var sLinkedChoiceId = oCheckable.getAttribute( "fse:linkedChoiceId" );
		if( sLinkedChoiceId != null ) {
			
			var aChoiceId = sLinkedChoiceId.split( "," );
			for( var c = 0; c < aChoiceId.length; c++ ) {
				
				var nLinkedChoiceId = aChoiceId[c];
				
				var bInverse = false;
				if( nLinkedChoiceId < 0 ) {
					bInverse = true;
					nLinkedChoiceId = nLinkedChoiceId * -1;
				}
				
				if( nLinkedChoiceId != nChoiceId ) {
					oChoice = document.getElementById( "Choice_" + nQuestionId + "_" + nLinkedChoiceId );
					if( bInverse ) {
						oChoice.checked = ! oCheckable.checked;
					} else {
						oChoice.checked = oCheckable.checked;
					}
					_enableFreeForm( oChoice );
				}
			}
			
		}
		
	}
	
	
};