Hi,
I am not sure why you want to change your job. But before doing so , i suggest you need to evaluate if you are looking for a change in the industry, (ie out of technology ) or just a change in company.
Just a thought, are you upset or considering a change in job because you feel you are not paid the "average salary" for the position you are holding ?
In hard times, a zero salary increment is possible for a change of job.
In good times, anything up to 50% is possible. Average is 10%-20%.