function vind(form) {
antwa = document.coord.a.value;
antwb = document.coord.b.value;
antwc = document.coord.c.value;
antwd = document.coord.d.value;
antwe = document.coord.e.value;
antwf = document.coord.f.value;
antwg = document.coord.g.value;
antwh = document.coord.h.value;
antwi = document.coord.i.value;
antwj = document.coord.j.value;

if (antwa == '(-7,-3)')  form.opl_a.value = ':)';
else {
                        form.opl_a.value = 'X';
        }
if (antwb == '(-6,6)')  form.opl_b.value = ':)';
else {
                        form.opl_b.value = 'X';
        }
if (antwc == '(-5,-6)')  form.opl_c.value = ':)';
else {
                        form.opl_c.value = 'X';
        }
if (antwd == '(0,-5)')  form.opl_d.value = ':)';
else {
                        form.opl_d.value = 'X';
        }
if (antwe == '(5,-6)')  form.opl_e.value = ':)';
else {
                        form.opl_e.value = 'X';
        }
if (antwf == '(2,-2)')  form.opl_f.value = ':)';
else {
                        form.opl_f.value = 'X';
        }
if (antwg == '(7,0)')  form.opl_g.value = ':)';
else {
                        form.opl_g.value = 'X';
        }
if (antwh == '(-5,0)')  form.opl_h.value = ':)';
else {
                        form.opl_h.value = 'X';
        }
if (antwi == '(-2,2)')  form.opl_i.value = ':)';
else {
                        form.opl_i.value = 'X';
        }
if (antwj == '(3,3)')  form.opl_j.value = ':)';
else {
                        form.opl_j.value = 'X';
        }

}

function replace(string,text,by) {
    var strLength = string.length, txtLength = text.length;
    if ((strLength == 0) || (txtLength == 0)) return string;
    var i = string.indexOf(text);
    if ((!i) && (text != string.substring(0,txtLength))) return string;
    if (i == -1) return string;
    var newstr = string.substring(0,i) + by;
    if (i+txtLength < strLength)
    newstr += replace(string.substring(i+txtLength,strLength),text,by);
    return newstr;
}