// Global variables
var isCSS, isW3C, isIE4, isNN4, isIE6CSS;

// initialize upon load to let all browsers establish content objects
function initDHTMLAPI() {
	if (document.images) {
		isCSS = (document.body && document.body.style) ? true : false;
		isW3C = (isCSS && document.getElementById) ? true : false;
		isIE4 = (isCSS && document.all) ? true : false;
		isNN4 = (document.layers) ? true : false;
		isIE6CSS = (document.compatMode && document.compatMode.indexOf("CSS1") >= 0) ? true: false;
	}
}

// set event handler to initialize API
window.onload = initDHTMLAPI;

// Seek nested NN4 layer from string name
function seekLayer(doc, name) {
	var theObj;
	for (var i = 0; i < doc.layers.length; i++) {
		if (doc.layers[i].name == name) {
			theObj = doc.layers[i];
			break;
		}
		// dive into the nested layers if necessary
		if (doc.layers[i].document.layers.length > 0) {
			theObj = seekLayer(doc.layers[i].document, name);
		}
	}
	return theObj;
}

// Convert object name string or object reference
// into a valid element object reference
function getRawObject(obj) {
	var theObj;
	if (typeof obj == "string") {
		if (isW3C) {
			theObj = document.getElementById(obj);
		} else if (isIE4) {
			theObj = document.all(obj);
		} else if (isNN4) {
			theObj = seekLayer(document, obj);
		}
	} else {
		// pass through object reference
		theObj = obj;
	}
	return theObj;
}

// Convert object name string or objet reference
// into a valid style (or NN4 layer) reference
function getObject(obj) {
	var theObj = getRawObject(obj);
	if (theObj && isCSS) {
		theObj = theObj.style;
	}
	return theObj;
}

// Position an object at a specific pixel coordinate
function shiftTo(obj, x, y) {
	var theObj = getObject(obj);
	if (theObj) {
		if (isCSS) {
			// equalize incorrect numeric value type
			var units = (typeof theObj.left == "string") ? "px" : 0;
			theObj.left = x + units;
			theObj.top = y + units;
		} else if (isNN4) {
			theObj.moveTo(x,y);
		}
	}
}

function shiftBy(obj, deltaX, deltaY) {
	var theObj = getObject(obj);
	if (theObj) {
		if (isCSS) {
			// equalize incorrect numeric value type
			var units = (typeof theObj.left == "string") ? "px" : 0;
			theObj.left = getObjectLeft(obj) + deltaX + units;
			theObj.top = getObjectTop(obj) + deltaY + units;
		} else if (isNN4) {
			theObj.moveBy(deltaX, deltaY);
		}
	}
}

// Set the z-order
function setBGColor(obj, color) {
	var theObj = getObject(obj);
	if (theObj) {
		if (isNN4) {
			theObj.bgColor = color;
		} else if (isCSS) {
			theObj.backgroundColor = color;
		}
	}
}

// Set the visibility of an object to visible
function show(obj) {
	var theObj = getObject(obj);
	if (theObj) {
		theObj.visibility = "visible";
	}
}

function closesubnav(event){
	if ((event.clientY <205)||(event.clientY > 350)){
		var theObj = getObject('divMenu')
		if (theObj) {
			theObj.visibility = "hidden";
		}
	}
	if ((event.clientX <1)||(event.clientX > 275)){
		var theObj = getObject('divMenu')
		if (theObj) {
			theObj.visibility = "hidden";
		}
	}
}

// Set the visibility of an object to hidden
function hide(obj) {
	var theObj = getObject(obj);
	if (theObj) {
		theObj.visibility = "hidden";
	}
}

function getObjectLeft(obj) {
	var elem = getRawObject(obj);
	var result = 0;
	if (document.defaultView) {
		var style = document.defaultView;
		var cssDecl = style.getComputedStyle(elem, "");
		result = cssDecl.getPropertyValue("left");
	} else if (elem.currentStyle) {
		result = elem.currentStyle.left;
	} else if (elem.style) {
		result = elem.style.left;
	} else if (isNN4) {
		result = elem.left;
	}
	return parseInt(result);
}

// Retrieve the y coordinate of a positionable object
function getObjectTop(obj) {
	var elem = getRawObject(obj);
	var result = 0;
	if (document.defaultView) {
		var style = document.defaultView;
		var cssDecl = style.getComputedStyle(elem, "");
		result = cssDecl.getPropertyValue("top");
	} else if (elem.currentStyle) {
		result = elem.currentStyle.top;
	} else if (elem.style) {
		result = elem.style.top;
	} else if (isNN4) {
		result = elem.top;
	}
	return parseInt(result);
}

// Retrieve the rendered width of an element
function getObjectWidth(obj) {
	var elem = getRawObject(obj);
	var result = 0;
	if (elem.offsetWidth) {
		if (elem.scrollWidth && (elem.offsetWidth != elem.scrollWidth)) {
			result = elem.scrollWidth;
		} else {
			result = elem.offsetWidth;
		}
	} else if (elem.clip && elem.clip.width) {
		result = elem.clip.width;
	} else if (elem.style && elem.style.pixelWidth) {
		result = elem.style.pixelWidth;
	}
	return parseInt(result);
}

// Retrieve the rendered height of an element
function getObjectHeight(obj) {
	var elem = getRawObject(obj);
	var result = 0;
	if (elem.offsetHeight) {
		result = elem.offsetHeight;
	} else if (elem.clip && elem.clip.height) {
		result = elem.clip.height;
	} else if (elem.style && elem.style.pixelHeight) {
		result = elem.style.pixelHeight;
	}
	return parseInt(result);
}

// Return the available content width space in browser window
function getInsideWindowWidth() {
	if (window.innerWidth) {
		return window.innerWidth;
	} else if (isIE6CSS) {
		// measure the html element's clientWidth
		return document.body.parentElement.clientWidth;
	} else if (document.body && document.body.clientWidth) {
		return document.body.clientWidth;
	}
	return 0;
}

// Return the available content height space in browser window
function getInsideWindowHeight() {
	if (window.innerHeight) {
		return window.innerHeight;
	} else if (isIE6CSS) {
		// measure the html element's clientHeight
		return document.body.parentElement.clientHeight;
	} else if (document.body && document.body.clientHeight) {
		return document.body.clientHeight;
	}
	return 0;
}