DONT PRESS THE BUTTON! DONT PRESS IT! DONT PRESS THE BUTTON! NEVER NEVER NEVER!
I WARNED YOU! (don't worry. its not like it will give you viruses. Its just annoying. Explanation of code on bottom. Modified version on blog)

You pressed the button, didn't you?

This is a fairly annoying bit of javascript trickery which is really quite funny. The main part is from this function:
function(evil)
{
var a=0;
while(a<1)
{
alert(".......");
}
}
where alert is the message that pops up. After pressing the button, evil() is called. alert gives the pop up window, but it will never go away. since a is always less than 1, it is an infinite loop that will always give the alert boxes once closed, too fast for you to close my window. I don't know of any other way to get rid of this other than Ctrl-Alt-Delete. Funny code, try it on your friends. It exploits the commonly made mistake of programming- infinite loops.