What is the most important difference between inner, outer, left and right joins? Please explain easy. Thanks!

Is there a between operator for php to compare a value with two values(maximum-mimimum) same time?

For example:

if( 1 <= $day => 31 ) ...
if( $day between 1 and 31 )...

I can write a function but I want to find the shortest way without manually functions.

function between($val, $min, $max){
   if($val >= $min && $val <= $max) return true;
   return false;
}

if(between($day, 1, 31)) ...

I have never worked with project management software etc but I think i need one now for a holiday-villages project with PHP. Are there really easy to use and fast to learn software/scripts ?

I am searching for a free dating script for freindship/dating sites. It must be multilingual and support west-european languages. It must have search filters like search by gender, age, region, interests etc... Any suggestion?

Does anybody know why Microsoft's new search engine Bing (MSN/Live/whatever..) sends fake referrer? Is not it unserious for a such company?

I change some options of 'Similar entries' block and try to save but nothing changes. I get no feedback if changes saved or any error occured. How can I fix this?

ehrecvr.exe is a hidden process of ms windows media center for additional multimedia functions.