c1=new Image(); c1.src="images/butt_gallery_a.gif";
c2=new Image(); c2.src="images/butt_biogra_a.gif";
c3=new Image(); c3.src="images/butt_exhib_a.gif";
c4=new Image(); c4.src="images/butt_rev_a.gif";
c5=new Image(); c5.src="images/butt_guest_a.gif";
c6=new Image(); c6.src="images/butt_comm_a.gif";


image_a=new Array("butt_gallery_a.gif", "butt_biogra_a.gif", "butt_exhib_a.gif", "butt_rev_a.gif", "butt_guest_a.gif", "butt_comm_a.gif");

image_na=new Array("butt_gallery_na.gif", "butt_biogra_na.gif", "butt_exhib_na.gif", "butt_rev_na.gif", "butt_guest_na.gif", "butt_comm_na.gif");


function onc(i,no,f){
document.images[f].src= "images/" + (no ? image_a[i] : image_na[i]);
}

function guest_f()
{ 
  if (document.forms[0].email.value == "") 
  { alert ("Please, enter your e-mail!");
    return false;
  } 
  if (document.forms[0].name.value == "") 
  { alert ("Please, enter your name!");
    return false;
  } 
   if (document.forms[0].surname.value == "") 
  { alert ("Please, enter your surname!");
    return false;
  }
  document.forms[0].action="mailto:webmanager@gorin.kiev.ua?cc=gorin@polynet.lviv.ua&subject=Igor Gorin guest's message!";
  return true; 
}