while sharing content in facebook from my asp.net website proper image is not showing in fecbook why?

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ASP.NET4

Hi,

From my asp.net website i wanted to share some content into facebook. after sharing it displays wrong images in facebook. i came to know that the images which are mentioned in meta tags of my website are displayed in facebook but i don't want to display those meta tag images. i want to display my own image. Anybody please give solution for this issue..
The javascript code which is used in my website for facebook sharing is below.

window.open('https://facebook.com/sharer.php?s=100&p[title]=mywebsitename&p[summary]=my content&p[url]=http://www.mywebsite.com&p[images]0]=http://www.mywebsite.com/Images/myownimage.png', 'facebook-share-dialog', 'width=626,height=350');

Thank you.