function preload_images(type,width,height,nums)
    {
        var images = new Array;

        for (var pic_num=1; pic_num<nums; pic_num++)
            {
            images[pic_num] = new Image(width,height);
            images[pic_num].src = ("./images/" + type + pic_num + "_400.jpg");


            }

      
    }




function btype() {
if(document.layers){
            thisbrowser="NN4";
        }
        if(document.all){
             thisbrowser="ie";
        }
        if(!document.all && document.getElementById){
             thisbrowser="NN6";
        }
//window.alert(thisbrowser);
}


function fadein(fname,lpic) {

if (lpic.indexOf('blankimage.gif') >= 1) return;
if (document.all) bigpic.filters.blendTrans.apply();
document.images.bigpic.src=fname;
if (document.all) bigpic.filters.blendTrans.play();
}

function layshow(lname) {
if (thisbrowser=="ie") document.all[lname].style.visibility="visible";
if (thisbrowser=="NN4") document[lname].visibility="visible";
if (thisbrowser=="NN6") document.getElementById([lname]).style.visibility="visible";


}

function layhide(lname) {
if (thisbrowser=="ie") document.all[lname].style.visibility='hidden';
if (thisbrowser=="NN4") document[lname].visibility="hidden";
if (thisbrowser=="NN6") document.getElementById([lname]).style.visibility="hidden";
}

function checkform ( form )
{
    // name val
  if (form.realname.value == "") {
    alert( "Please enter your name" );
    form.realname.focus();
    return false ;
    }
    
     // email val
  if (form.email.value == "") {
    alert( "Please enter your email address" );
    form.email.focus();
    return false ;
    }
    var txt = form.email.value;
     var n = txt.length;
     var ok = true;
     var cnt = 0;
     for (var i=0; i<n; i++)
     {
       var oneChar = txt.charAt(i);
       if (oneChar == '@')
       {
         if (cnt == 0)
         {
           cnt++;
         }
         else
         {
           alert ("Illegal E-mail Address!");
           return false;
         }
       } 
     }
     if (!cnt)
     {
       alert ("Illegal E-mail Address!");
       return false;
       }
 // comment val
if (form.comment.value == "") {
    alert( "Please enter your comment" );
    form.comment.focus();
    return false ;
    
  }
  // email val
  return true ;
}