How do I pass arrgument To text from showModalDialog without window pop up

Hei ,
I would like to know How to pass argument from from showmodalDiolog box without Window pop if the option available is only one.Below are the code i used to produce the ShowModalDialog . Tell me I if the possible or not.

[CODE]
function openWin2(win2,tran){
var tran_cde = tran.value;
var page2 = “rea_cde.jsp?tran_cde=”+tran_cde;
if(win2.showModalDialog(page2,argrea_cde,”dialogHeight:250px;dialogWidth:300px”)== true){
eval(“document.all.rea_desc.value = argrea_cde.arg_rea_desc”);
eval(“document.all.rea_cde.value = argrea_cde.arg_rea_cde”);
}
}
[/CODE]

The code above is to asssign to pass the from the show. How do I pass the value without the window pop up.

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