<a onclick="dovizhesapla('1500','600');" href="#"> Hesapla </a>
<script>

function dovizhesapla(width,height){
var url    = 'dovizhesapla.php?fiyat=';
$(function(){
var fiyat = $('input[name="fiyat"]').val();
return window.open(url+fiyat,'','width='+width+',height='+height);


});
}

</script>