I want to create a inputtext field with a lookup icon next to it and when i click the lookup image, it has to display all the values with checkbox and when i select a checkbox or more, the text field has to be filled with the checkbox values with comma seperated.
can someone guide me with the code
Although no one is going to write code for you, I'd advise taking a look at Roll Your Own "Lookup" Popup Window by Jeff Douglas who goes through and explains how to do this.
If you want to select a list of records (a bit like a List View), you'd need to use a Wrapper Class. You can find an article which discusses exactly how to do this here with selecting and processing records as you describe.
Otherwise, you might want to check out how you can do this using JavaScript. There's a nice tutorial here which should point you in the right direction.
