JQuery: Div background image scale

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I am using Jquery to add background image to a div which keeps changing on elements click.

The image is adding correctly but it is not occupying the whole div space due to smaller dimension. I would like the image to fit the div width height.

Could someone please help which property should I use to achieve this which should work on all browsers

This is the code I am using

var image_url = “url(”+_xmlUnitObj.img+“) no-repeat left top”;
$(‘#rightMenu’).css(“background”, image_url);

where _xmlUnitObj.img contains the image path
and rightMenu is the div id.