function stoperror() {return true;}
window.onerror=stoperror;
		 
		 
function popupWindow(url) {
  window.open(url,'popupWindow','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=yes,copyhistory=no,width=100,height=100,screenX=10,screenY=10,top=10,left=10')
}


function change_quantity(i,min,max) { 

       qty_field = document.getElementsByName(i+'_quantity')[0];
	   qty_field.value++ ;
       qty_field.className ='selected'; 
	   if (qty_field.value <min) { qty_field.value=min; }
	      else if (qty_field.value >max && max!=-1) { qty_field.value=max; }
	   
}


function check_value(i,min,max) { 

    qty_field = document.getElementsByName(i+'_quantity')[0];
    if (qty_field.value <1) { qty_field.value=0; qty_field.className ='deselected'; }
    if (qty_field.value <min && qty_field.value!=0 ) { qty_field.value=min; }
	   else if (qty_field.value >max && max!=-1) { qty_field.value=max; }
}