// Author: Matt Kruse <matt@mattkruse.com>
// WWW: http://www.mattkruse.com/
function getAnchorPosition(anchorname){
	var useWindow=false;
	var coordinates=new Object();
	var x=0,y=0;
	var use_gebi=false, use_css=false, use_layers=false;
	if(document.getElementById){
		use_gebi=true;
	}else if(document.all){
		use_css=true;
	}else if(document.layers){
		use_layers=true;
	}
	if(use_gebi && document.all){
		x=AnchorPosition_getPageOffsetLeft(document.all[anchorname]);
		y=AnchorPosition_getPageOffsetTop(document.all[anchorname]);
	}else if(use_gebi){
		var o = document.getElementById(anchorname);
		if(o == null){
			o = anchorname;
		}
		x=AnchorPosition_getPageOffsetLeft(o);
		y=AnchorPosition_getPageOffsetTop(o);
	}else if(use_css){
		x=AnchorPosition_getPageOffsetLeft(document.all[anchorname]);
		y=AnchorPosition_getPageOffsetTop(document.all[anchorname]);
	}else if(use_layers){
		var found=0;
		for(var i=0;i<document.anchors.length;i++){
			if(document.anchors[i].name==anchorname){
				found=1;
				break;
			}
		}
		if(found==0){
			coordinates.x=0;
			coordinates.y=0;
			return coordinates;
		}
		x=document.anchors[i].x;
		y=document.anchors[i].y;
	}else{
		coordinates.x=0;
		coordinates.y=0;
		return coordinates;
	}
	coordinates.x=x;
	coordinates.y=y;
	return coordinates;
}

function getAnchorWindowPosition(anchorname){
	var coordinates=getAnchorPosition(anchorname);
	var x=0;
	var y=0;
	if(document.getElementById){
		if(isNaN(window.screenX)){
			x=coordinates.x-document.body.scrollLeft+window.screenLeft;
			y=coordinates.y-document.body.scrollTop+window.screenTop;
		}else{
			x=coordinates.x+window.screenX+(window.outerWidth-window.innerWidth)-window.pageXOffset;
			y=coordinates.y+window.screenY+(window.outerHeight-24-window.innerHeight)-window.pageYOffset;
		}
	}else if(document.all){
		x=coordinates.x-document.body.scrollLeft+window.screenLeft;
		y=coordinates.y-document.body.scrollTop+window.screenTop;
	}else if(document.layers){
		x=coordinates.x+window.screenX+(window.outerWidth-window.innerWidth)-window.pageXOffset;
		y=coordinates.y+window.screenY+(window.outerHeight-24-window.innerHeight)-window.pageYOffset;
	}
	coordinates.x=x;
	coordinates.y=y;
	return coordinates;
}

function AnchorPosition_getPageOffsetLeft(el){
	var ol = el.offsetLeft;
	while((el=el.offsetParent) != null){
		ol += el.offsetLeft;
	}
	return ol;
}

function AnchorPosition_getWindowOffsetLeft(el){
	return AnchorPosition_getPageOffsetLeft(el) - document.body.scrollLeft;
}

function AnchorPosition_getPageOffsetTop(el){
	var ot=el.offsetTop;
	while((el=el.offsetParent) != null){
		ot += el.offsetTop;
	}
	return ot;
}

function AnchorPosition_getWindowOffsetTop(el){
	return AnchorPosition_getPageOffsetTop(el)-document.body.scrollTop;
}