jquery - How to select a specific HTML page thruogh javascript -

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does know how write function select specific page in javascript? reason why asking because have multiple projects use same base master pages , placeholders. need able change of projects individual pages (css & html) out changes of pages in particular project.

my javascript code:

function initpage() {     $('div#rightcontent img').replacewith('<img src="newpicfile.jpg">'); }

the problem code changes of divs id of rightcontent. need target 1 page in particular. can me?

place in code - 

function initpage() {         if("http://mydomain.com/page.html" == location.href) {          $('div#rightcontent img').replacewith('<img src="newpicfile.jpg">');     } }

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