JQuery Animation fails randomly

I tried to implement jQuery Animation in my site, but randomly after seconds, minutes or hours, the animation throws an error: "Invalid property value" Line 154 Char 4889 jquery-ui-1.7.2-custom.js.

Here is my Code:

            $(idTimer).animate({backgroundColor: '#aa0000', color: '#ffffff'}, 1000);
            $(idPrice).animate({backgroundColor: '#aa0000', color: '#ffffff'}, 1000);

            $(idTimer).animate({backgroundColor: '#ffffff', color: '#f67802'}, 1000);
            $(idPrice).animate({backgroundColor: '#ffffff', color: '#000000'}, 1000);

Of course the IDs are correctly set. When the animation hangs up, no animation will be done anymore for this ID, so it's very开发者_C百科 mysterious. Please help, its urgent.

Here is the failing code, beginning char 4889:

h.elem.style[f]="rgb("+[Math.max(Math.min(parseInt((h.pos*(h.end[0]-h.start[0]))+h.start[0],10),255),0),Math.max(Math.min(parseInt((h.pos*(h.end[1]-h.start[1]))+h.start[1],10),255),0),Math.max(Math.min(parseInt((h.pos*(h.end[2]-h.start[2]))+h.start[2],10),255),0)].join(",")+")"}});

try like this

$(idTimer).animate({'backgroundColor': '#aa0000', 'color': '#ffffff'}, 1000);