CvCam callback problems

Hello 

Im new to OpenCv and just starting to learn it, i encountered a 
problem 
which i cannot solve and cannot find any solution on web. Im trying 
to 
process frames using callback function from CvCam manual (one which 
draws a line): 


void callback(IplImage* image)//Draws blue horizontal lines across 
the 
image 
{ 
 IplImage* image1 = image; 
 int i,j; 


 assert (image); 


 for(i=0; i<image1->height; i+=10) 
 { 
    for(j=(image1->widthStep)*i; j<(image1->widthStep)*(i+1); 
          j+=image1->nChannels) 
    { 
       image1->imageData[j]   = (char)255; 
       image1->imageData[j+1] = 0; 
       image1->imageData[j+2] = 0; 


    } 


 } 



} 


But instead of a line it draws 5 strange colored shapes in different 
locations in the window. Im using VC++ 6 and openCV beta5. 

Thanks in advance 











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