Inserting new html file to erpnext

I want to display the contents of one html file to one of the DIV, that i inserted in modules_section.html.How is it possible? Where I have to store new HTML file and how it is possible?.Please help me

customising erpnext’s core files. I want to display some contents from one file(now html) as a test case .For that in modules_section.html I inserted some of the DIv s it works properly with images now on that place I want to display the contents of a html file . Please help me

Share what you have tried so far.