var ms = navigator.appVersion.indexOf("MSIE");
var ie4 = (ms>0) && (parseInt(navigator.appVersion.substring(ms+5, ms+6)) >= 4)
var nesc = navigator.appName.lastIndexOf("Netscape");
var nesc4 = (nesc >= 0) && (parseInt(navigator.appVersion.substring(0,2)) >= 4);

function fullscreen75(){
	if (nesc4){
		var pageHeight = window.screen.height;
		pageHeight = pageHeight-40;
    		pagewin = window.open("./book/index.html","screen","width=" + 1000 + ",height=" + 690);
		pagewin.moveTo(0,0);
		pagewin.focus();
	}else if (ie4){
		window.open("./book/index.html","screen","width=" + 1000 + ",height=" + 690);
	}else{
		location.href="./book/index.html";
	}
}