img1 = new Image;
img1.src = "images/button_pageFlip_l_a.gif";
img2 = new Image;
img2.src = "images/button_pageFlip_r_a.gif";
//
siteWindow = 0;

function imgRoll(state, which,img){
	if(state==1){
		rollState = "a";
	}else{
		rollState = "i";
	}
	document.getElementById(which).src = "images/"+img+"_"+rollState+".gif";
}

// Open pop-up window with specified parameters
function centerScreen(URL, sizeX, sizeY, scrolls,name) {
	
	if(sizeX == "" || sizeY == ""){
		x=800;y=600;
	} else {
	  x=sizeX;y=sizeY;
	}
	if (scrolls == 1){
		scroller = "yes"
	}else{
		scroller = "no"
	}
	if(name!=null){
		nameVal = name;
	}else{
		nameVal = "popWin"
	}
	winLeft=eval(screen.availWidth/2)-(x/2);
	winTop=eval(screen.availHeight/2)-(y/2);
  siteWindow = window.open
	(URL,nameVal,"width="+x+",height="+y+",toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars="+scroller+",resizable=yes,left="+winLeft+",top="+winTop);
}

function pageFlipper(which){
	if(next!=0){
		nextParts = "<a href=\"" + next + ".html\" onMouseOver=\"imgRoll(1,'pageFlip_r_" + which + "','button_pageFlip_r')\" onMouseOut=\"imgRoll(0,'pageFlip_r_" + which + "','button_pageFlip_r')\"><img src=\"images/button_pageFlip_r_i.gif\" width=\"21\" height=\"21\" border=\"0\" id=\"pageFlip_r_" + which + "\"></a>"
	}else{
		nextParts = ""
	}
	document.write("<a href=\"" + prev + ".html\" onMouseOver=\"imgRoll(1,'pageFlip_l_" + which + "','button_pageFlip_l')\" onMouseOut=\"imgRoll(0,'pageFlip_l_" + which + "','button_pageFlip_l')\"><img src=\"images/button_pageFlip_l_i.gif\" width=\"21\" height=\"21\" border=\"0\" id=\"pageFlip_l_" + which + "\"></a><span class=\"pageNums\">" + pageNum + " / 41</span>"+nextParts);
}