// ********************************
// application-specific functions *
// ********************************


function macIEreposition()
{
    if (navigator.appVersion.indexOf("Macintosh")>=0 && navigator.appVersion.indexOf("MSIE")>=0)
   {
         for (counter=1; counter<=15; counter++)
         {
	styleObject = getStyleObject('menu' + counter);
	styleObject.top = styleObject.top-50;
         }
   }
}

function showMenu(menuNumber,eventObj) {
    hideAllMenus();
    var menuId = 'menu' + menuNumber;
    if (changeObjectVisibility(menuId, 'visible')) {
	var menuTitle = getStyleObject('menuTitle' + menuNumber);
	menuTitle.backgroundColor = '#ff9900';
	eventObj.cancelBubble = true;
	return true;
    } else {
	return false;
    }
}

var numMenus = 10;

function hideAllMenus() {
    for(counter = 1; counter <= numMenus; counter++) {
	changeObjectVisibility('menu' + counter, 'hidden');
	var menuTitle = getStyleObject('menuTitle' + counter);
	menuTitle.backgroundColor = '#000000';
    }
}

document.onclick = hideAllMenus;

// ************************
// layer utility routines *
// ************************

function getStyleObject(objectId) {
    // cross-browser function to get an object's style object given its id
    if(document.getElementById && document.getElementById(objectId)) {
	// W3C DOM
	return document.getElementById(objectId).style;
    } else if (document.all && document.all(objectId)) {
	// MSIE 4 DOM
	return document.all(objectId).style;
    } else if (document.layers && document.layers[objectId]) {
	// NN 4 DOM.. note: this won't find nested layers
	return document.layers[objectId];
    } else {
	return false;
    }
} // getStyleObject

function changeObjectVisibility(objectId, newVisibility) {
    // get a reference to the cross-browser style object and make sure the object exists
    var styleObject = getStyleObject(objectId);
    if(styleObject) {
	styleObject.visibility = newVisibility;
	return true;
    } else {
	// we couldn't find the object, so we can't change its visibility
	return false;
    }
} // changeObjectVisibility

function moveObject(objectId, newXCoordinate, newYCoordinate) {
    // get a reference to the cross-browser style object and make sure the object exists
    var styleObject = getStyleObject(objectId);
    if(styleObject) {
	styleObject.left = newXCoordinate;
	styleObject.top = newYCoordinate;
	return true;
    } else {
	// we couldn't find the object, so we can't very well move it
	return false;
    }
} // moveObject