function refreshparent()
   {
   opener.location.reload(true);
   self.close();
   }

function button_on ( imgName ) {
	butOn = eval ( imgName + "_on.src" );
	document [imgName].src = butOn;
}

function button_off ( imgName ) {
	butOff = eval ( imgName + "_off.src" );
	document [imgName].src = butOff;
}

function cache_images(img_name_array){

  for(x=0;x<img_name_array.length;x++) {
    eval(img_name_array[x]+"_off=new Image();");
    eval(img_name_array[x]+"_off.src=\"images/"+img_name_array[x]+"_off.gif\";");
    eval(img_name_array[x]+"_on=new Image();");
    eval(img_name_array[x]+"_on.src=\"images/"+img_name_array[x]+"_on.gif\";");
  }


}

var global=new Array('nav_about','nav_products','nav_resources','nav_contact');

cache_images(global);


function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}

function navigate(choice) {

  if(choice.options[choice.selectedIndex].value=="viewfinders"){
    url="http://www.atlanticfilm.com/view/";
    window.open(url,'','scrollbars=yes,width=800,height=600,status,resizable,menubar,toolbar,location');
    refreshparent();
  }else{
    return choice.options[choice.selectedIndex].value;
  }
}


function changeparent(url)
{
  opener.location=url;
  self.close();
}

var myWindow;
function openCenteredWindow(url) {
    var width = 600;
    var height = 400;
    var left = parseInt((screen.availWidth/2) - (width/2));
    var top = parseInt((screen.availHeight/2) - (height/2));
    var windowFeatures = "width=" + width + ",height=" + height + 
        ",status,resizable,menubar,location,scrollbars,toolbar,left=" + left + ",top=" + top + 
        "screenX=" + left + ",screenY=" + top;
    myWindow = window.open(url, "subWind", windowFeatures);
}



var AlphaNum = /[^a-zA-Z0-9]/;
var validEMail = /^[a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$/;
function checkAlphaNum( f ) {
	if( f.value.length > 0 ) {
		if( AlphaNum.test(f.value) == true ) {
			alert( f.name + ": Please only use AlphaNumeric Characters" );
			return false;
		} else return true;
	} else {
		alert( f.name + ": Field left blank" );
		return false;
	}
}

function checkForm( f ) {
	var err = new String();

	if( f.slaFName.value.length <= 0 )
		err += "\tFirst / Given Name left empty\n";

	if( f.slaLName.value.length <= 0 )
		err += "\tLast / Family Name left empty\n";

	if( f.slaEmail.value.length <= 0 )
		err += "\tEMail Address left empty\n";
	else if( validEMail.test(f.slaEmail.value) == false )
		err += "\tIncorrect EMail address format\n";

	if( f.slaMessage.value.length <= 0 )
		err += "\tMessage left empty\n";
	
	if( err.length > 0 ) {
		alert( "The following errors have been encountered:\n" + err );
		return false;
	} else return true;
}



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 == '');
}