width = screen.availWidth-10; 
height = screen.availHeight-30;
awidth = ((width-770)/2);
aheight = ((height-540)/2);

function open_preview(path)
{
	dummy = window.open(path,'Afdruk_Preview','width=770,height=540,left=' + awidth + ',top=' + aheight + ',toolbar=no,menubar=no,resizable=yes,status=no,alwaysRaised=yes,scrollbars=no');
}

function open_maxwindow(path)
{
	dummy2 = window.open(path, 'Invoice','width=' + width + ',height=' + height + ',left=0,top=0,toolbar=no,menubar=no,resizable=yes,status=no,alwaysRaised=yes,scrollbars=yes'); 
}

function open_previewscroll(path)
{
	dummy = window.open(path,'Afdruk_Preview','width=770,height=540,left=' + awidth + ',top=' + aheight + ',toolbar=no,menubar=no,resizable=yes,status=no,alwaysRaised=yes,scrollbars=yes');
}