function rollover(rowId){
	document.getElementById(rowId).className = 'viewrowover';
}
function rollout(rowId){
	document.getElementById(rowId).className = 'viewrow';
}
function openDocument(documentURL){
	//Compute the relative path and assign it to baseURL in the HTML Head of the
	//ViewTemplate. Then this function can be called from views.
	top.body.location.href = documentURL; 
}
function toggleCategory(catId){
	//builds a URL to either expand or collapse a category based on the current state
	var newViewURL = '';
	//if a start parameter is in effect we must keep it as it determines the page to display
	if (startCount != ''){
		newViewURL = baseViewURL + '&Start=' + startCount
	} else {
		newViewURL = baseViewURL
	}
	//find the image for the clicked category to determine it's current state
	var currentCatImage = document.getElementById('cat' + catId).src;
	if (currentCatImage.toLowerCase().indexOf('expand') == -1){
		//the current category does not have expand image, so it is already expanded
		newViewURL += '&Collapse=' + catId + '#' + catId;
	} else {
		newViewURL += '&Expand=' + catId + '#' + catId;
	}
	window.location.href = newViewURL;
}
function setCategories(){
	var viewURL = window.location.href.toLowerCase();
	var selectedCategory = '';
	
	if (viewURL.indexOf('expandview') > 0){
		setAllTwisties();
	}
	
	if (viewURL.indexOf('expand=') > 0){
		setTwisties(expandCat, true);
	}
	if (viewURL.indexOf('collapse=') > 0){
		setTwisties(collapseCat, false);
	}
	
}
function setTwisties(catID, expandAction){
	var catLength = catID.length
	
	//set up all subcategories
	for (counter = 0; counter < catLength; counter++){
		if (catID.charAt(counter) == '.'){
			setTwistie(catID.substring(0, counter))
		}
	}
	if (expandAction){
		//set up the actual category clicked, if user is expanding
		setTwistie(catID)
	}	
	
}
function setAllTwisties(){
	//function called when Expand All being used, updates all twisties
	for (counter = 0; counter < document.images.length; counter++){
		imageId = document.images[counter].id
		if (imageId.indexOf('cat') != -1){
			setTwistie(imageId.substring(3))
		}
	}
}
function setTwistie(catID){
	//this code changes the image of a twistie and changes it's URL
	try {
		var twistieImage = document.all['cat' + catID]
		twistieImage.src = 'collapse.gif';
	} catch(e){}
}
function expandAll(){
	document.frames['viewdata'].document.getElementById('expand_all').click();
}
function collapseAll(){
	document.frames['viewdata'].document.getElementById('collapse_all').click();
}
function nextPage(){
	document.frames['viewdata'].document.getElementById('next_page').click();
}
function previousPage(){
	document.frames['viewdata'].document.getElementById('previous_page').click();
}
function refreshView(){
	document.frames['viewdata'].location.reload();
}