This would help:

function addArr(){
var arr1 = [1,2,3,4];
var arr2 = [5,6,7,8];
arr3=arr1;//or u can use arr1 itself;
for(i=arr1.length,j=0;j<arr2.length;i++){
arr3[i]=arr2[j];
j++;...

Try this:
document.getElementById('txt').attributes['required'].value;
Regards...

try this : http://in2.php.net/download-docs.php

You can search for PHP Manuals in CHM format. CHMs are easier to deal with.