if (document.images)
   {
   	 nav1on= new Image(153,215);
     nav1on.src="images/navigation/overview_over2.jpg";  
     nav1off= new Image(153,215);
     nav1off.src="images/navigation/overview_off2.jpg";
	 
	 nav2on= new Image(155,215);
     nav2on.src="images/navigation/case_studies_over2.jpg";  
     nav2off= new Image(155,215);
     nav2off.src="images/navigation/case_studies_off2.jpg";
	 
	 nav3on= new Image(80,215);
     nav3on.src="images/navigation/about_over2.jpg";  
     nav3off= new Image(80,215);
     nav3off.src="images/navigation/about_off2.jpg";
	 
   }
   
function MM_showHideLayers() { //v3.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v='hide')?'hidden':v; }
    obj.visibility=v; }
}

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

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

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_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

function lightup(imgName)
 {
   if (document.images)
    {
      imgOn=eval(imgName + "on.src");
      document[imgName].src= imgOn;
    }
 }

function turnoff(imgName)
 {
   if (document.images)
    {
      imgOff=eval(imgName + "off.src");
      document[imgName].src= imgOff;
    }
 }
 
 function hideLayer(whichLayer) {

if (document.getElementById) {
// this is the way the standards work
document.getElementById(whichLayer).style.visibility = "hidden";
}
else if (document.all) {
// this is the way old msie versions work
document.all[whichlayer].style.visibility = "hidden";
}
else if (document.layers) {
// this is the way nn4 works
document.layers[whichLayer].visibility = "hidden";
}

}

function showLayer(whichLayer) {

if (document.getElementById) {
// this is the way the standards work
document.getElementById(whichLayer).style.visibility = "visible";
}
else if (document.all) {
// this is the way old msie versions work
document.all[whichlayer].style.visibility = "visible";
}
else if (document.layers) {
// this is the way nn4 works
document.layers[whichLayer].visibility = "visible";
}

}

function handleClick(whichClick,theLayer) {

if (whichClick == "hide it") {
// then the user wants to hide the layer
hideLayer(theLayer);

}
else if (whichClick == "show it") {
// then the user wants to show the layer
showLayer(theLayer);
}

}


function putMessage(error_message){
        alert(error_message);
        return false;   
}

function checkEmail(email){
        var email_string = email.value; 
        var at_position = email_string.indexOf('@'); 
        var dot_position = email_string.indexOf('.', at_position); 
        var extension = email_string.substring(dot_position+1,email_string.length); 
        
        if(at_position<0){
                return false; 
        } else if (dot_position<0){
                return false; 
        } else if (extension.length<=0){
                return false; 
        } 
        return true; 
}

function hasValue(obj, obj_type){
    if (obj_type == "TEXT" || obj_type == "PASSWORD"){
        if (obj.value.length == 0) 
                return false;
        else 
                return true;
    } else if (obj_type == "SINGLE_VALUE_RADIO" || obj_type == "SINGLE_VALUE_CHECKBOX") {
                if (obj.checked)
                        return true;
                else
                return false;   
        } else if (obj_type == "RADIO" || obj_type == "CHECKBOX") {
                for (i=0; i < obj.length; i++){
                        if (obj[i].checked)
                                return true;
                }
                return false;   
        } else  if (obj_type == "SELECT") {
                if (obj.selectedIndex == 0)
                        return false;
                else
                        return true;
        }
}

function hasValue2(obj1, obj2, obj3, obj4, obj5, obj6){
        var flag = 0;
        for (i=1; i < 7; i++){
                if (obj[i].checked)
                        flag = i;
                }
        if (flag == 0)
                return false;
        else
                return true;
}

function  checkFormContact(this_form){
    if  (!hasValue(this_form.firstname, "TEXT" )) {
                if  (!putMessage("Please enter your first name")){
                        return false; 
                }
        }
	if  (!hasValue(this_form.lastname, "TEXT" )) {
                if  (!putMessage("Please enter your last name")){
                        return false; 
                }
        }
	if  (!hasValue(this_form.zip, "TEXT" )) {
                if  (!putMessage("Please enter your zip")){
                        return false; 
                }
        }
    if  (!hasValue(this_form.email, "TEXT" )) {
                if  (!putMessage("Please enter your email address")){
                        return false; 
                }
        } else {
                if (!checkEmail(this_form.email)){
                        if  (!putMessage("Please enter valid email address")){
                                return false; 
                        }
                }
        }
		
	
        
        return true;    
}

function  checkFormContactW(this_form){
    if  (!hasValue(this_form.firstname, "TEXT" )) {
                if  (!putMessage("Please enter your first name")){
                        return false; 
                }
        }
	if  (!hasValue(this_form.lastname, "TEXT" )) {
                if  (!putMessage("Please enter your last name")){
                        return false; 
                }
        }
	if  (!hasValue(this_form.zip, "TEXT" )) {
                if  (!putMessage("Please enter your zip")){
                        return false; 
                }
        }
	if  (!hasValue(this_form.phone, "TEXT" )) {
                if  (!putMessage("Please enter your telephone")){
                        return false; 
                }
        }
    if  (!hasValue(this_form.email, "TEXT" )) {
                if  (!putMessage("Please enter your email address")){
                        return false; 
                }
        } else {
                if (!checkEmail(this_form.email)){
                        if  (!putMessage("Please enter valid email address")){
                                return false; 
                        }
                }
        }
	if  (!hasValue(this_form.sales, "TEXT" )) {
                if  (!putMessage("Please enter your annual sales")){
                        return false; 
                }
        }
	
        
        return true;    
}