Now...let see something for our biz...how but...mix this two girls in to one pic... This is our girls...
now...because they are 640x480 we will make some new document...let's be 1000x480px...you know...File/New (or jus CTRL+N) and then put the numbers...now...
Copy this two pictures in to our new document...How can we do it...easy. Just click on picture, press CTRL+A and then CTRL+C (for copy), then click in to the our empty/new document (that 1000x480 document

) and pres CTRL+V (for paste)...do same thing with other picture...and now, we have something like this...
Ok, now click on "marquee tool"
and mark your leyer like this...
then, final and most important thing...Click on Select/Feather (Alt+Ctrl+D) and set it on 70! DO NOT DESELECT YOUR SELECTION YET!Then just pres Delete button 3x and...whoooooala...
any questions?