function popup(name, height, width)
{	
	win = window.open('', name, config="height=" + height + ", width=" + width + ", toolbar=no, menubar=no, resizable=no, left=" + ((screen.width - width) / 2) + ", top=" + ((screen.height - height) / 2) + "");
	win.focus();
}

function calc(frm)
{
	if (frm.elements['qt'].value == 1)
		reduc = 0;
	else if ((frm.elements['qt'].value >= 2) && (frm.elements['qt'].value <= 10))
		reduc = 10;
	else if ((frm.elements['qt'].value >= 11) && (frm.elements['qt'].value <= 20))
		reduc = 15;
	else if ((frm.elements['qt'].value >= 21) && (frm.elements['qt'].value <= 30))
		reduc = 20;
	else if ((frm.elements['qt'].value >= 31) && (frm.elements['qt'].value <= 40))
		reduc = 25;
	else if ((frm.elements['qt'].value >= 41) && (frm.elements['qt'].value <= 50))
		reduc = 30;
	else
		reduc = 0;

	var total = 24.90 * frm.elements['qt'].value;
	var tot = total;
	
	total = total - (total * reduc / 100);
	tot = tot - total;
	tot = tot.toFixed(2);
	total = total.toFixed(2);

	frm.elements['total'].value = total + ' EUR';
	frm.elements['reduc'].value = tot + ' EUR (' + reduc + '%)';
}