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Replace the default triangle dropdown image with some other symbol.


I have used collapsible="true" in pageBlockSection and it is working fine.
Now, I have a requirement wherein I have to replace the image (default triangle image) with + sign or some similar symbol.
Any idea how can I achive this?
Although I tried some hacking and with inspect element I was able to get the Id but the problem is that I have approximately 10 pageblocksection on the page(in all I have to replace the image) also they get displayed dynamically(i.e based on some conditions).