if(navigator)  {
        
	button01=new Image();
		button01.src="../../images/Btns/PrevBtnOver.jpg";

	button02=new Image();
		button02.src="../../images/Btns/PrevBtnDown.jpg";

	button03=new Image();
		button03.src="../../images/Btns/NextBtnOver.jpg";

	button04=new Image();
		button04.src="../../images/Btns/NextBtnDown.jpg";
		        
}

function jumpTo (theLength,theIndex) {

	var Page = new Array(theLength + 1);
		Page[1] = "./1_Contents.html";
		Page[2] = "./2_Introduction.html";
		Page[3] = "./3_Letter.html";
		Page[4] = "./4_Explanation.html";
		Page[5] = "./sims/Spreadsheet/Spreadsheet.html";
		Page[6] = "../Exercises.html#Assignment2";

	for (i = 0; i <=theLength; i++) {
		if(theIndex==i) {
			window.location = Page[i+1];
		}
	}
}