i'm tring to upgrade a jquery application from 1.3.2 to 1.4.1

changing only the jquery include statement to the latest version i'm receiving the message in the subject.

this seems to happen on moveTo and LineTo function calls of this piece of code:

ctx = $('#EmendLinks').get(0).getContext('2d');

ctx.beginPath();

ctx.moveTo(xstart,ystart);

ctx.lineTo(xstart,ybaseline);

ctx.lineTo(xend-25,ybaseline);

ctx.lineTo(xend-4,yend);

ctx.lineTo(xend,yend);

ctx.stroke();