IE7 raises an error on line 32 due to an extra comma. It is strange. I did not make any other changes and it was working for a few days and then it started to raise this error. I simply removed the trailing comma in ui.slider.js.

slider.slider({

maxValue: cur.attr("max"), minValue: cur.attr("min"), startValue: this.getAttribute("value"), stepping: cur.attr("step"), change: function(e, ui) { cur[0].value = ui.value; cur[0].setAttribute("value", ui.value); }

});