var rollOverImgObj=new Object();
rollOverImgObj['enter']    = new Image(); rollOverImgObj['enter'].src    = 'images/enter_on.png';
var saveImgObj=new Image();

function swapImage(imageName){
	var imgObj=eval('document.'+imageName);
	saveImgObj.src=imgObj.src;
	imgObj.src=rollOverImgObj[imageName].src;
}

function swapImgRestore(imageName){
	var imgObj=eval('document.'+imageName);
	imgObj.src=saveImgObj.src;
}


function showBeginners(){
	var hasReqestedVersion = DetectFlashVer(requiredMajorVersion, requiredMinorVersion, requiredRevision);
	
	if ( hasReqestedVersion ) {
	var beginnersWin=window.open('beginners/main.html','beginner','toolbar=0, location=0, directories=0, status=1, menubar=0, scrollbars=0, resizable=0, width='+screen.availWidth+', height='+screen.availHeight+', left='+screen.left+', top='+screen.top);
	}
	else{
		window.location='flashInstall.html';
	}
}

function showEnvironment(){
	var defaultHeight=850;
	var height     = (screen.availHeight < defaultHeight) ? screen.availHeight : defaultHeight;
	var width      = (screen.availHeight < defaultHeight) ? 576 : 560;
	var scrollbars = (screen.availHeight < defaultHeight) ? 1 : 0;
	var keirin_env=window.open('keirin_env/','keirin_env','toolbar=0, location=0, directories=0, status=1, menubar=0, scrollbars='+scrollbars+', resizable=1, width='+width+', height='+height);
}