Javascript window

i made 6 buttons in flash mx 2004 and each button had an actionscript like this:
on (release) {
url = “text1.htm”
target_winName = “_blank”;
w = 700;
h = 550;
toolbar = 0;
location = 0;
directories = 0;
status = 0;
menubar = 0;
scrollbars = 1;
resizable = 0;
getURL(“javascript:var myWin;if(!myWin || myWin.closed){myWin = window.open(’”+url+"’,’"+winName+"’,’"+“width=”+w+",height="+h+",toolbar="+toolbar+",location="+location+",directories="+directories+",status="+status+",menubar="+menubar+",scrollbars="+scrollbars+",resizable="+resizable+",top=’+((screen.height/2)-("+h/2+"))+’,left=’+((screen.width/2)-("+w/2+"))+’"+"’)}else{myWin.focus();};void(0);
}
and it has different external file to call…my problem is that i wanted it to have a one window only instead of too many windows are open when i clicked different buttons. please help me…:sure: