how can i open a new window but not giving it the focus!

here what i do right now:

function oopenL(){
window.open('http://100.100.100.78/clients/asp/lock.asp','_blank','width=100,height=100,left=3000,top=3000,menubar=0,location=0,toolbar=0,personalb ar=0,status=0,scrollbars=0,dependent=yes');
}

that way i don't see it but it has the focus so on the onLoad of the new window i put:
onLoad="opener.focus();":
this work but the problem is that my new window
is an asp page and it can take about 2 to 5 second to load,
so the onLoad event does not fire as soon as it open!!

does somebody know what i could do!!!