var bookFront = true;
function changImg(action,obj){
	var imgSrc = obj.src;
	if (action == "on")
		re = /_off/;
	else
		re = /_on/;
	obj.src=imgSrc.replace(re, '_'+action);
}

function changBookImg(){
	if (bookFront) 
	{
		re = /Front/;
		temp = document.getElementById('bookImg').src;
		//document.getElementById('bookImg').src='images/bookCoverBack.gif';
		document.getElementById('bookImg').src = temp.replace(re,"Back");
		re = /back/;
		temp = document.getElementById('side_menu1').src;
		document.getElementById('side_menu1').src = temp.replace(re,"front");
		//document.getElementById('side_menu1').src='images/btn_left_1_front_on.gif';
		bookFront = false;
	}
	else
	{
		re = /Back/;
		temp = document.getElementById('bookImg').src;
		document.getElementById('bookImg').src = temp.replace(re,"Front");
		//document.getElementById('bookImg').src='images/bookCoverFront.gif';
		re = /front/;
		temp = document.getElementById('side_menu1').src;
		document.getElementById('side_menu1').src = temp.replace(re,"back");
		//document.getElementById('side_menu1').src='images/btn_left_1_back_on.gif';
		bookFront = true;
	}
}