javascript - Unexpected value NaN parsing x attribute -


i have written fancy heat graph javascript & raphael , worked great , flawlessly. now, 3 months after completed task , went on other pastures, error: 

unexpected value nan parsing x attribute

...with particular snippet of code in leading instance indicating error taking place. (yes error lists 500+ times leading instance gives line of code error takes place.)

i looked around , found nothing substantial leading me solution. so, managed remove code listed in leading instance, hoping solve problem. , case, propagates line of code, time in raphael.js code...

how 1 troubleshoot that?? don't want fix raphael code, if don't have to... appreciated.

more code

function todayband(){     // band represents *today*     (var i=2; i<47; i++){         xx = parseint(calcoffset+i*hour_millis/(2*timezoom)); x2 =  xoff(xx-100,220);                    pp = "p_"+i;         window[pp] = paper.path("m "+xx+" 350 l "+x2+" -220 z").attr("stroke", "#999").toback();   //present time line in red         window[pp].class="paths";         paper.path("m "+xx+" 350 l 0 15 z").attr("stroke", "#aaa" ).toback();   //present time line in red     } }

tia

dennis


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