showmodaldialog function

I have an online application form that uses pop up windows to assist with validation checks on mandatory fields.  This is causing numerous problems with windows xp sp2 with the new pop up blocking facility in internet explorer.  I would like to resolve this problem by changing the javascript from window.open to create.popup. Is there an alternative to showModalDialog function ?

function MessageBox(val)
var ver = version();

if (document .all && showmodalDialog && ver>=Version && !isIE4)
{
var dir = ver > 12.1 ? "onlinema" : "online";
var url = getbase()+"../../html/"+dir+"/alert.htm";
var attrs = getattrs(val);

prompt = val;
showModalDialog(url,window,attrs);
}
else
{
alert(val);
}
symanskiAsked:
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devicCommented:
xp and sp2 =  forget any popup forever

except user adds your site to "allowed"
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