popUp window not working in Explorer

hi

i have a site which has pop up windows - working fine everywhere except for Internet Explorer - help anybody?! the code goes as follows

thankyous…

on (release) {
//customize the window that gets opened
// 0 equals NO.
// 1 equals YES.
address = “http://www.freelancecameraman.info/cigs.html”;
target_winName = “andy cotton”;
width = 495;
height = 490;
toolbar = 0;
location = 0;
directories = 0;
status = 0;
menubar = 0;
scrollbars = 0;
resizable = 0;
//sends data back to the function
openWinCentre(address, target_winName, width, height, toolbar, location, directories, status, menubar, scrollbars, resizable);
}

_root.openWinCentre = function (url, winName, w, h, toolbar, location, directories, status, menubar, scrollbars, resizable) {

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);");

}