Tutorial JavaScript MD5

var MD5 = function (string) {

function RotateLeft(lValue, iShiftBits) {
return (lValue<>>(32-iShiftBits));
}

function AddUnsigned(lX,lY) {
var lX4,lY4,lX8,lY8,lResult;
lX8 = (lX & 0x80000000);
lY8 = (lY & 0x80000000);
lX4 = (lX & 0x40000000);
lY4 = (lY & 0x40000000);
lResult