I was just browsing the code of a site I am soon to be redoing.. which is something I often do just to see the standard of the previous designer/programmer.

onMouseDown="MM_goToURL('parent','thepage.htm');return document.MM_returnValue">
Can anyone tell me what the purpose of using 'onmousedown' to move to another page is?.. or was the guy just getting carried away with the behaviours in Dreamweaver...