checkbox and javascript

Nov 22 2013 1:07 AM

I have 3 checkbox ,which load 25,12,39 respective markers on google maps.When i click on 1st checkbox ,it loads 25 markers ,but when i click 2nd checkbox ,it loads 12 markers ,but the 1st 25 markers are gone.How to get rid of this pblm..

Is there some other way than checkbox to use this??