Images Slide show - Image array in Java script

#Code to make images as slide show by using images in an array

<!-- script for reading the images from the image array for slideshow.  -->

<script language="JavaScript" type="text/javascript">
<!--
var imgArray=  new Array( "images/eg1.jpg",  "images/eg2.jpg ");

var rotate_delay = 5000;// delay in milliseconds (5000 = 5 secs)

current = 0;


function next() {
if (document.slideform.slide.value<imgArray.length-1) {
document.images.show.src = imgArray[current+1];
document.slideform.slide.value = ++current;
}
else first();
}

function previous() {
if (current-1 >= 0) {
document.images.show.src = imgArray[current-1];
document.slideform.slide.value = --current;
}
else last();
}

function first() {
current = 0;
document.images.show.src = imgArray[0];
document.slideform.slide.value = 0;
}

function last() {
current = imgArray.length-1;
document.images.show.src = imgArray[current];
document.slideform.slide.value = current;
}

function ap(text) {
document.slideform.slidebutton.value = (text == "Stop") ? "Start" : "Stop";
rotate();
}


function rotate() {
if (document.slideform.slidebutton.value == "Stop") {
current = (current == imgArray.length-1) ? 0 : current+1;
document.images.show.src = imgArray[current];
document.slideform.slide.value = current;
window.setTimeout("rotate()", rotate_delay);
}
}

//-->
</script>

MAGIC SQUARE

Ramanujan Magic square:

An easy way of creating birthday magic square:

Eg :

16	3	19	90
91	18	0	19
1	18	92	17
20	89	17	2

All rows: 

16+3+19+90 = 128

91+18+0+19 = 128

1+18+92+17 = 128

20+89+17+2 = 128

All Columns:  

16+91+1+20 = 128

3+18+18+89 = 128

19+0+92+17 = 128

90+19+17+2 = 128

Middle Numbers: 18+18+92+0 = 128

All corners: 16+90+20+2 = 128

Each block: 

16+3+91+18= 128

 19+0+90+19 = 128

 1+18+20+89 = 128

 92+17+17+2 = 128

Sides : 

 91+1+19+17 = 128

 3+19+89+17 = 128

Middle blocks: 

91+18+1+18 = 128

 0+19+92+17 = 128

Side diagonals:  

 91+3+92+19 = 128

 19+19+1+89 = 128

Diagonals : 

16+18+92+2 = 128

 20+18+0+90 = 128

Let us take  four columns with variables a1,b1,c1,d1 

and follwoing the matrices the next rows are a2,b2,c2,d2.....till d4 as the last element.

First we will fill the first now with the DOB of the person.

Now a1 = 16 , b1 = 3 , c1 = 19 ,d1 = 90

Next rows are calculated as follows:

a2 = d1 +1;         b2  =  c1 - 1;       c2 = b1 - 3;      d2 = a1 + 3;

a3 = b1 - 2;        b3 =  a1 + 2;        c3 = d1 + 2;      d3 = c1 - 2;

a4 = c1 + 1;        b4 = d1 - 1;         c4 = a1 + 1;      d4 = b1 - 1;

Check : Sum of a2 + a3 + a4 = d1 + 1 + b1 -2 + c1 +1 = d1 + b1 + c1 .

Adding this to a1 gives the sum a1 + b1 + c1 + d1 which is sum of our original numbers taken.

Same is applicable for other variables.

Logic : The value of the element position is sum of any other variable plus a constant of type integer.

At any point the sum of any set of four elements as mentioned in the above cases should give a constant sum of zero and no variable should be repeated.Then our square is a magic square.

a1	b1	c1	d1
a2	b2	c2	d2
a3	b3	c3	d3
a4	b4	d4	d4

a1	b1	c1	d1
d1 + 1	c1 – 1	b1 - 3	a1 + 3
b1 – 2	a1 + 2	d1 + 2	c1 – 2
c1 + 1	d1 – 1	a1 + 1	b1 - 1

By the above procedure we can generate 4 * 4 magic square.