efficient way to bind a drag event

Question

i have read a program that have a drag functionality in a table but i really think it is not efficient , here is the code

var downState = false;
$('#element').delegate('td','mousedown',function() {
    downState = true;
    //do stuff
}).delegate('td','mouseenter',function() {
   if (downState) 
   //do stuff
});

what i don't like is when a user hovers on a table cell he triggers the mouse enter event

is there more efficient way ?