var nMaxPages = 0;

slidesArray = new Array();
slidesArray[0] = "main1.htm";
slidesArray[1] = "main2.htm";
slidesArray[2] = "main3.htm";
slidesArray[3] = "main4.htm";
slidesArray[4] = "main5.htm";
slidesArray[5] = "main6.htm";
slidesArray[6] = "main7.htm";
slidesArray[7] = "main8.htm";
slidesArray[8] = "main9.htm";
slidesArray[9] = "main10.htm";
slidesArray[10] = "main11.htm";
slidesArray[11] = "main12.htm";
slidesArray[12] = "main13.htm";
slidesArray[13] = "main14.htm";
slidesArray[14] = "main15.htm";
slidesArray[15] = "main16.htm";
slidesArray[16] = "main17.htm";
slidesArray[17] = "main18.htm";
slidesArray[18] = "main19.htm";
slidesArray[19] = "main20.htm";
slidesArray[20] = "main21.htm";
slidesArray[21] = "main22.htm";
slidesArray[22] = "main23.htm";
nMaxPages = slidesArray.length-1;
function slideShow(){
parent.document.getElementById("contentFrame").src = slidesArray[ parent.nNumber ];

//determine the correct bottom navigation page.
var sBotURL = "";
if( parent.nNumber == slidesArray.length-1 ){ 
	//alert( "at end" ); 
	sBotURL = "bot_navBack.htm";   }
else if( parent.nNumber == 0 ){ 
	//alert( "at start" );
	sBotURL = "bot_navNext.htm"; 
}
else { sBotURL = "bot_nav.htm" }

if( String( sBotURL ).length>0 ){ parent.document.getElementById("botFrame").src = sBotURL }
}

function increaseParentNumber(){
	if( parent.nNumber == null || typeof( parent.nNumber ) == "undefined" ){
		parent.nNumber = 1;
	}
	else if( parent.nNumber < nMaxPages ){ parent.nNumber ++ }
}

function nextPage(){
	increaseParentNumber();
	slideShow();
}

function previousPage(){
	decreaseParentNumber();
	slideShow();
}

function decreaseParentNumber(){
	if( parent.nNumber == null || typeof( parent.nNumber ) == "undefined" ){ parent.nNumber = 0; }
	else if( parent.nNumber > 0 ){ parent.nNumber -- }
}

function setParentNumber( nNumber ){
	if( nNumber == null || typeof( nNumber ) == "undefined" ){ nNumber = 0;	}
	else if( nNumber > nMaxPages ){ nNumber = nMaxPages; }
	parent.nNumber = nNumber;
	slideShow();
}