PHP Job Progress Bar

Hi, we have huge number of query and calling of API so we want to show people about the progress and do not Freeze there Browsers. i want PHP Based Progress Bar that do following things : 1) It needs to be Class / Component that well commented that we can use with any project. 2) it needs to be ajax based so that it will show real time progress of the whole job. 3) we will provide Total number of jobs in integer and then we will use this with For, while loop so that it will show the progress bar and also the work completed. 4) Very Importantly we do not want People Browser to FREEZE. waiting for your good bids.