How do I escape data in javascript?

I am getting data through php via <a onmouseup="fnc('needs_to_be_escaped_var')"></a>

I've been trying to escape it in php but it isn't working. I was wondering if there was a way to escape it in javascript? Thanks.

(I need to escape out single and double quotes for outputing into an html div)

 

easiest way: use escape(charstring) method, or encodeURI( URIString ) or encodeURIComponent( encodedURIString )

 

Use this:
escape();

 

Maybe this is also helpful: http://www.w3schools.com/jsref/jsref_escape.asp