document.write ("<div align=\"left\" id=\"frmfly\" style=\"position:absolute; background-color:white; top:0; left:780px; width:306px; display:none; visibility:visible\">"); 
if (screen.height>800){
document.write ("<iframe height=768 frameborder=0 width=306 scrolling=no src=\"http://www320d.mackolik.com/ndetay_background_3.html?v=01.000002?v=12.132\"></iframe>"); 
}else {
document.write ("<iframe height=768 frameborder=0 width=306 scrolling=no src=\"http://www320d.mackolik.com/ndetay_background_2.html?v=01.000002?v=12.132\"></iframe>"); 
}
document.write ("</div>");
var nOffSet = 320;var winwide="on";
var iTotalHeight = screen.height>800 ? 760 : 510;
var frmfly = document.getElementById("frmfly");
frmfly.style.posLeft = document.body.clientWidth-nOffSet;

if(window.attachEvent){
	window.attachEvent ("onscroll", HandlePositionChange);
} else if(document.addEventListener || window.addEventListener){
	if(document.addEventListener){
		document.documentElement.addEventListener("scroll", HandlePositionChange, false);
	}; 
	if(window.addEventListener){
		window.addEventListener("scroll", HandlePositionChange, false);
	};
} 

if(document.body.clientWidth > 725){
	setTimeout ("frmfly.style.display='';HandlePositionChange();", 500);}
	else{var winwide = "off";}

if(document.body.clientWidth > 725){
	frmfly.style.visibility = 'visible';HandlePositionChange();
}

var sOldTop = Math.max(document.body.scrollTop,document.documentElement.scrollTop);

function HandlePositionChange () {
	var cHeight = document.documentElement.clientHeight;
	var sTop = Math.max(document.body.scrollTop,document.documentElement.scrollTop);
	var iDirection =  sTop - sOldTop;
	var iDivTop = frmfly.offsetTop;
	
	sOldTop = sTop;
	var bScroll = false;
	
	if (sTop+cHeight < iTotalHeight ) {
		bScroll = false;
	} 
	
	if ((iDirection < 0 && sTop <= iDivTop) || (iDirection > 0 && sTop + cHeight >= iDivTop + iTotalHeight )) {
		bScroll = true;	
	} 
	
	if (bScroll) {
		with (document.body){ 
			frmfly.style.left = clientWidth - nOffSet;
			if (cHeight < iTotalHeight) {
				if (iDirection > 0 ){ 
					frmfly.style.top = (sTop - (iTotalHeight-cHeight)) + "px";	
				} else {
					frmfly.style.top = sTop + "px";
				}
			} else {
				frmfly.style.top = sTop + "px";
			}
		}
	}
}
<!--P-->