Stuff

<script type="text/css">

// minimum dimensions of swf
minW = 780;
minH = 585;

function onResize() {
	
	var w = document.body.clientWidth;
	var h = document.body.clientHeight;

	// set this to the id attribute of your swfs object/embed tag(s)
	var swf = document.getElementById("MYSWFID");
	   
	if( swf.style.width == "100%" ) {
		if( w < minW ) swf.style.width = minW+"px";
	} else {
		if( w > minW ) swf.style.width = "100%";
	}
	   
	if( swf.style.height == "100%" ) {
		if( h < minH ) swf.style.height = minH+"px";
	} else {
		if( h > minH ) swf.style.height = "100%";
	}
	   
}
</script>

<body onresize="onResize()">