Add a variable in string

    <img src="http://track.opicle.com/aff_l?offer_id=2193&adv_sub=LEAD_ID" width="1" height="1" />   var x ;   x Should be replace at the place of LEAD_ID     <img src="http://track.opicle.com/aff_l?offer_id=2193&adv_sub=x" width="1" height="1" />   Meas var x will replace at the place of Lead_ID

Refer the below code.

HTML

<img id="img" width="1" height="1"

Script

var x = 1;
var src = 'http://track.opicle.com/aff_l?offer_id=2193&adv_sub=' + x;
var image = document.getElementById('img');
image.src = image;

this is opicle code we have to write same as a posted only the lead_id will replace by numeric value.

Not getting you, please explain in details.