var win = null;

function detailImageWindow(urlImage,name,w,h){
    LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
    TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
    settings = 'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',resizable';
    url = '/imageDetail.php?image='+urlImage;
    win = window.open(url,name,settings)
}

function checkQuantity(form)
{
    zero = true;
    i = 1;
    while(zero && (o=document.getElementById('quantity-'+i)))
    {
        val = o.value;
        if(o.value!='0')
          zero = false;
        i++;
    }
    if(zero)
    {
        alert('Vyberte počet kusů zboží, který chcete vložit do košíku');
        return false;
    }
    return true;
}