mac = (navigator.appVersion.indexOf("Mac")>-1) ? true : false; // Mac
ie = (document.all) ? true : false; // IE
safari = (navigator.appVersion.indexOf("Safari")>-1) ? true : false; // Safari
gecko = (navigator.userAgent.indexOf("Gecko/") > -1)? true : false; // Gecko

function openWin(wUrl,wName,wWidth,wHeight,wScroll,wResize,wStatus,wCenter){
	wOption1 = "toolbar=no,location=no,directories=no,status=" + wStatus + ",menubar=no,scrollbars=" + wScroll + ",resizable=" + wResize + ",width=" + wWidth + ",height=" + ((safari && (wStatus == "yes" || wStatus == 1))?(wHeight+16):wHeight);
	if (wCenter == "yes" || wCenter == 1) {
		scWidthCenter = screen.availWidth / 2;
		scHeightCenter = screen.availHeight / 2;
		wOption2 = ",left=" + (scWidthCenter - (wWidth / 2)) + ",top=" + (scHeightCenter - (wHeight / 2));
	}
	else {
		wOption2 = "";
	}
	w = window.open(wUrl,wName,wOption1+wOption2);
	w.focus();
}


<!--
if (document.images) { 
// あらすじ
var img1on = new Image();
img1on.src = "image/RE_button_story_on.gif";
var img1off = new Image();
img1off.src = "image/RE_button_story_off.gif";
// 著者：REとは？
var img2on = new Image();
img2on.src = "image/RE_button_author_on.gif";
var img2off = new Image();
img2off.src = "image/RE_button_author_off.gif";
// この本の読みかた
var img3on = new Image();
img3on.src = "image/RE_button_howto_on.gif";
var img3off = new Image();
img3off.src = "image/RE_button_howto_off.gif";
// REインタビュー
var img4on = new Image();
img4on.src = "image/RE_button_interview_on.gif";
var img4off = new Image();
img4off.src = "image/RE_button_interview_off.gif";
// プレゼント
var img5on = new Image();
img5on.src = "image/RE_button_present_on.gif";
var img5off = new Image();
img5off.src = "image/RE_button_present_off.gif";
} 
function On(name) { 
if (document.images) { 
document.images[name].src = eval(name + 'on.src'); 
} 
} 
function Off(name) { 
if (document.images) { 
document.images[name].src = eval(name + 'off.src'); 
} 
} 
// -->