function fullscreen(){
	self.moveTo(0,0);
	self.resizeTo(screen.availWidth,screen.availHeight);

	var isWin=(navigator.appVersion.indexOf("Win")!=-1)? true : false;
	var isIE=(navigator.appVersion.indexOf("MSIE")!=-1)? true : false;

	if(isWin&&isIE){
		var fullwindow = window.open("index_main.html",'CZL',"fullscreen=yes");
		fullwindow.focus();
	}else{
// 	AK: for non-ie browsers, specify width and height instead of using fullscreen 
		var fullwindow = window.open("index_main.html","CZL","width="+screen.availWidth+",height="+screen.availHeight);
		fullwindow.moveTo(0,0);
		fullwindow.focus();
	}
	document.location = 'index.html';
}