Is there a way to remove blank lines from my script?

[unknowncat]

Hi All,

 

I think I must have transferred my script in the wrong mode, it now has three blank lines between every line of code!  several thousands of lines long now, it's too big to do it manually.  I use html-kit for my file editor, does anyone have a hint for how I could remove all this useless empty space?  And prevent it from happening again?  Thanks ahead of time.