function checkboxChange(id) {
	var hidden = document.getElementById(id);
	var checkbox = document.getElementById("chk"+id);
	if(checkbox.checked) {
		hidden.value = "true";
	} else {
		hidden.value = "false";
	}
}

var groups = new Array();

function registerGroup(groupId, fieldIdArray) {
	groups[groupId] = fieldIdArray;
}

// If the supercheckbox was checked, it will be unchecked and all
// other subcheckboxes will be set to unchecked. If the 
function subCheckboxChange(fieldId, groupId) {
	var superCheckbox = document.getElementById(groupId);
	var subCheckBoxIdArray = groups[groupId];
	if (superCheckbox.checked) {
		superCheckbox.checked = false;
		for (var i=0; i<subCheckBoxIdArray.length; i++) {
			if (subCheckBoxIdArray[i] != fieldId) {
				setCheckboxToFalse(subCheckBoxIdArray[i]);
			}
		}
	}
	checkboxChange(fieldId);
}

function CheckboxGroupSelectChange(groupId) {
	var combobox = document.getElementById(groupId);
	var subCheckBoxIdArray = groups[groupId];
	
	if (combobox.options[combobox.selectedIndex].value==0) {
		//Unknown
		for (var i=0; i<subCheckBoxIdArray.length; i++) {
			setCheckboxToNull(groups[groupId][i]);
			changeDisabledState("chk"+groups[groupId][i],true);
		}
	} else if (combobox.options[combobox.selectedIndex].value==1){
		//No
		for (var i=0; i<subCheckBoxIdArray.length; i++) {
			setCheckboxToFalse(groups[groupId][i]);
			changeDisabledState("chk"+groups[groupId][i],true);
		}
	} else if (combobox.options[combobox.selectedIndex].value==2){
		//Yes
		for (var i=0; i<subCheckBoxIdArray.length; i++) {
			setCheckboxToFalse(groups[groupId][i]);
			changeDisabledState("chk"+groups[groupId][i],false);
		}
	}
}

function changeDisabledState(fieldId, newState){
	document.getElementById(fieldId).disabled = newState;	
}

function setCheckboxToFalse(fieldId) {
	var hidden = document.getElementById(fieldId);
	var checkbox = document.getElementById("chk"+fieldId);
	checkbox.checked = false;
	hidden.value = "false";
}

function setCheckboxToNull(fieldId) {
	var hidden = document.getElementById(fieldId);
	var checkbox = document.getElementById("chk"+fieldId);
	checkbox.checked = false;
	hidden.value = "";
}

function radioChange(hiddenId, radioId) {
	var hidden = document.getElementById(hiddenId);
	var radio = document.getElementById(radioId);
	if(radio.checked) {
		hidden.value = radio.value;
	}
}

function enableDisable(component1, component2) {
	document.getElementById(component1).disabled = false;
	document.getElementById(component2).disabled = true;
}

function checkUncheck(component1, component2) {
	document.getElementById(component1).checked = false;
	document.getElementById(component2).checked = true;
}

function openPopup(page, name, width, height) {
       window.open(page, name, "menubar=no, status=no, scrollbars=yes, menubar=no, width=" + width + ", height=" + height);
}