//scroll back to top
function backToTop() {
	var x1 = x2 = x3 = 0;
	var y1 = y2 = y3 = 0;

	if (document.documentElement) {
		x1 = document.documentElement.scrollLeft || 0;
		y1 = document.documentElement.scrollTop || 0;
	}

	if (document.body) {
		x2 = document.body.scrollLeft || 0;
		y2 = document.body.scrollTop || 0;
	}

	x3 = window.scrollX || 0;
	y3 = window.scrollY || 0;

	var x = Math.max(x1, Math.max(x2, x3));
	var y = Math.max(y1, Math.max(y2, y3));

	window.scrollTo(Math.floor(x / 2), Math.floor(y / 2));

	if (x > 0 || y > 0) {
		window.setTimeout("backToTop()", 125);
	}
}

//Add To Bookmarks
function bookmark()
{
var title="Ocean and Earth"
var url="http://www.oceanandearth.co.za/"
if (window.sidebar) window.sidebar.addPanel(title, url,"");
else if( window.opera && window.print )
{
var dcE = document.createElement('a');
dcE.setAttribute('rel','sidebar');
dcE.setAttribute('href',url);
dcE.setAttribute('title',title);
dcE.click();
}
else if( document.all ) window.external.AddFavorite( url, title);
}

//Form Validate
function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_validateForm() { //v4.0
  var i,p,q,nm,test,num,min,max,errors='',args=MM_validateForm.arguments;
  for (i=0; i<(args.length-2); i+=3) { test=args[i+2]; val=MM_findObj(args[i]);
    if (val) { nm=val.name; if ((val=val.value)!="") {
      if (test.indexOf('isEmail')!=-1) { p=val.indexOf('@');
        if (p<1 || p==(val.length-1)) errors+='- '+nm+' must contain an e-mail address.\n';
      } else if (test!='R') { num = parseFloat(val);
        if (isNaN(val)) errors+='- '+nm+' must contain a number.\n';
        if (test.indexOf('inRange') != -1) { p=test.indexOf(':');
          min=test.substring(8,p); max=test.substring(p+1);
          if (num<min || max<num) errors+='- '+nm+' must contain a number between '+min+' and '+max+'.\n';
    } } } else if (test.charAt(0) == 'R') errors += '- '+nm+' is required.\n'; }
  } if (errors) alert('The following error(s) occurred:\n'+errors);
  document.MM_returnValue = (errors == '');
}

// Newsletter Form Validator
function checkForm()
{
 var myForm=document.newsletter;
 var myString=myForm.email.value;
 var foundAtPosition=0;
 var count=0;

 if(myForm.email.value == "")
 {
  alert('Please enter your email address');
  myForm.email.focus();
  return false;
 }
 else
 {
  while(foundAtPosition != -1)
  {
   foundAtPosition=myString.indexOf("@",foundAtPosition);

   if(foundAtPosition != -1)
   {
    count++;
    foundAtPosition++;
   }
  }
 }

 if(count == 0)
 {
  alert('Please enter a valid email address');
  myForm.email.focus();
  myForm.email.select();
  return false;
  }
  return true;
}

// Print Document
function printDoc(){
	window.print();
}

// Close Document
function closeWin(){
	window.close();
}