var ns4;

var op5;

var op6;

var agt;

var mac;

var ie; 

var mac_ie;



function sniffBrowsers() {

	ns4 = document.layers;

	op5 = (navigator.userAgent.indexOf("Opera 5")!=-1) ||(navigator.userAgent.indexOf("Opera/5")!=-1);

	op6 = (navigator.userAgent.indexOf("Opera 6")!=-1) ||(navigator.userAgent.indexOf("Opera/6")!=-1);

	agt=navigator.userAgent.toLowerCase();

	mac = (agt.indexOf("mac")!=-1);

	ie = (agt.indexOf("msie") != -1); 

	mac_ie = mac && ie;

}





function getStyleObject(objectId, doc) {

    if(document.getElementById && document.getElementById(objectId)) {

	return document.getElementById(objectId).style;

    } else if (document.all && document.all(objectId)) {

	return document.all(objectId).style;

    } else if (document.layers && document.layers[objectId]) {

		return getObjNN4(document,objectId);

    } else {

	return false;

    }

} 



function changeObjectVisibility(objectId, newVisibility) {

    var styleObject = getStyleObject(objectId, document);

    if(styleObject) {

	styleObject.visibility = newVisibility;

	return true;

    } else {

	return false;

    }

} 



function findImage(name, doc) {

	var i, img;

	for (i = 0; i < doc.images.length; i++) {

    	if (doc.images[i].name == name) {

			return doc.images[i];

		}

	}

	for (i = 0; i < doc.layers.length; i++) {

    	if ((img = findImage(name, doc.layers[i].document)) != null) {

			img.container = doc.layers[i];

			return img;

    	}

	}

	return null;

}



function getImage(name) {

	if (document.layers) {

    	return findImage(name, document);

	}

	return null;

}



function getObjNN4(obj,name)

{

	var x = obj.layers;

	var foundLayer;

	for (var i=0;i<x.length;i++)

	{

		if (x[i].id == name)

		 	foundLayer = x[i];

		else if (x[i].layers.length)

			var tmp = getObjNN4(x[i],name);

		if (tmp) foundLayer = tmp;

	}

	return foundLayer;

}



function getElementHeight(Elem) {

	if (ns4) {

		var elem = getObjNN4(document, Elem);

		return elem.clip.height;

	} else {

		var elem;

		if(document.getElementById) {

			var elem = document.getElementById(Elem);

		} else if (document.all){

			var elem = document.all[Elem];

		}

		if (op5) {

			xPos = elem.style.pixelHeight;

		} else {

			xPos = elem.offsetHeight;

		}

		return xPos;

	} 

}



function getElementWidth(Elem) {

	if (ns4) {

		var elem = getObjNN4(document, Elem);

		return elem.clip.width;

	} else {

		var elem;

		if(document.getElementById) {

			var elem = document.getElementById(Elem);

		} else if (document.all){

			var elem = document.all[Elem];

		}

		if (op5) {

			xPos = elem.style.pixelWidth;

		} else {

			xPos = elem.offsetWidth;

		}

		return xPos;

	}

}



function getElementLeft(Elem) {

	if (ns4) {

		var elem = getObjNN4(document, Elem);

		return elem.pageX;

	} else {

		var elem;

		if(document.getElementById) {

			var elem = document.getElementById(Elem);

		} else if (document.all){

			var elem = document.all[Elem];

		}

		xPos = elem.offsetLeft;

		tempEl = elem.offsetParent;

  		while (tempEl != null) {

  			xPos += tempEl.offsetLeft;

	  		tempEl = tempEl.offsetParent;

  		}

		return xPos;

	}

}





function getElementTop(Elem) {

	if (ns4) {

		var elem = getObjNN4(document, Elem);

		return elem.pageY;

	} else {

		if(document.getElementById) {	

			var elem = document.getElementById(Elem);

		} else if (document.all) {

			var elem = document.all[Elem];

		}

		yPos = elem.offsetTop;

		tempEl = elem.offsetParent;

		while (tempEl != null) {

  			yPos += tempEl.offsetTop;

	  		tempEl = tempEl.offsetParent;

  		}

		return yPos;

	}

}





function getImageLeft(myImage) {

	var x, obj;

	if (document.layers) {

		var img = getImage(myImage);

    	if (img.container != null)

			return img.container.pageX + img.x;

		else

			return img.x;

  	} else {

		return getElementLeft(myImage);

	}

	return -1;

}



function getImageTop(myImage) {

	var y, obj;

	if (document.layers) {

		var img = getImage(myImage);

		if (img.container != null)

			return img.container.pageY + img.y;

		else

			return img.y;

	} else {

		return getElementTop(myImage);

	}

	return -1;

}



function getImageWidth(myImage) {

	var x, obj;

	if (document.layers) {

		var img = getImage(myImage);

		return img.width;

	} else {

		return getElementWidth(myImage);

	}

	return -1;

}







function getImageHeight(myImage) {

	var y, obj;

	if (document.layers) {

		var img = getImage(myImage);

		return img.height;

	} else {

		return getElementHeight(myImage);

	}

	return -1;

}



function moveXY(myObject, x, y) {

	obj = getStyleObject(myObject)

	if (ns4) {

		obj.top = y;

 		obj.left = x;

	} else {

		if (op5) {

			obj.pixelTop = y;

 			obj.pixelLeft = x;

		} else {

			obj.top = y + 'px';

 			obj.left = x + 'px';

		}	

	}

}



function changeClass(Elem, myClass) {

	var elem;

	if(document.getElementById) {

		var elem = document.getElementById(Elem);

	} else if (document.all){

		var elem = document.all[Elem];

	}

	if (op5 || op6) elem.style.className = myClass;

	else elem.className = myClass;

}



function changeBGColour(myObject, colour) {

	if (ns4) {

		var obj = getObjNN4(document, myObject);

		obj.bgColor=colour;

	} else {

		var obj = getStyleObject(myObject);

		if (op5) {

			obj.background = colour;	

		} else {

			obj.backgroundColor = colour;

		}	

	}

}



function changeImage(target, source) {

	var imageObj;

	

	if (ns4) {

		imageObj = getImage(target);

		if (imageObj) imageObj.src = eval(source).src; 

	} else {

		imageObj = eval('document.images.' + target);

		if (imageObj) imageObj.src = eval(source).src; 

	}

}