where to keep the database in a phonegap application

[theman22]

I am new to the Phone gap domain.i have done a small application in android.i just thought of implementing it in Phone Gap and see how it works?I have used a static database in my android project.i want to use the same for the Phone Gap project?My big Doubt is where will we keep this Database and how will we access them?for example..in android we create a Db methods...and store what we want in an array list? and then access them when we want?for example\[code\]instance name = db.arraylistname(id);column name = instance name.get(0).get("column name");\[/code\]other doubt is about images.what resolution images(hdpi/mdpi/ldpi/xhdpi) should we use in the www/img/ folder?which language is better to use in Phone Gap Jquery or java script?