Sendig value to php page, want to opne in same browser

Hello Great Coder

I have made the code
on(release){
loadVariablesNum(“http://domainname.com/product_listing.php",“this”,"POST”);
}

to passing value to php page. But it’s open in new browser

if i used it following way
on(release){
loadVariablesNum(“http://domainname.com/product_listing.php",“this”,"POST”, “_self”);
}

it gives ERROR

Is there any way to open result page in same browser

Amyanet1