I have an issue when I drag a part of an image to select its parts

Question

hello gusys

I am developing a custom image crop script, but I couldn't able to drag over the image and I could solve this issue by using e.preventDefault (); but it doesn't work in IE6, so how I can drag over an image in IE6,

$('#img').mousedown(function(e) {
  e.preventDefault();
  //my code goes here
})

works in all browsers except ie6, please help, thanks in advance