function Back() { history.back(); }

function changepic(img_name,img_obj) 
{
	if (document.images) 
	{
		document.images[img_name].src = img_obj.src;
	}
}

function getObj(name)
{
  if (document.getElementById)
  {
  	this.obj = document.getElementById(name);
	this.style = document.getElementById(name).style;
  }
  else if (document.all)
  {
	this.obj = document.all[name];
	this.style = document.all[name].style;
  }
  else if (document.layers)
  {
	this.obj = getObjNN4(document,name);
	this.style = this.obj;
  }
}

function getObjNN4(obj,name)
{
	var x = obj.layers;
	var thereturn;
	for (var i=0;i<x.length;i++)
	{
		if (x[i].id == name)
		 	thereturn = x[i];
		else if (x[i].layers.length)
			var tmp = getObjNN4(x[i],name);
		if (tmp) thereturn = tmp;
	}
	return thereturn;
}



function checkform(form) 
{
	var message = '';
	if(form.subject.value == '- Please Choose -'){message += 'Missing Subject \n';}
	if(form.name.value == ''){message += 'Missing Name \n';}
	if(form.email.value != '')
	{
		if(!isEmail(form.email.value)){message += 'Invalid Email Address \n';}
	}
	else {message += 'Missing Email \n';}
	if(form.message.value == ''){message += 'Missing Message \n';}
	if(!message){return true;}
	else{
		var msgtext = "The following problems occured during submission: \n\n"
		msgtext += message;
		alert(msgtext);
		return false;
	}
}

function isEmail(str) 
{
  // are regular expressions supported?
  var supported = 0;
  if (window.RegExp) {
    var tempStr = "a";
    var tempReg = new RegExp(tempStr);
    if (tempReg.test(tempStr)) supported = 1;
  }
  if (!supported)
    return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
  var r1 = new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");
  var r2 = new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$");
  return (!r1.test(str) && r2.test(str));
}

function locate(page) { location=page; }


function helpwindow(url, name)
{
	var w = window.open(url,
			    name,
			    "scrollbars,width=300,height=400,status");
}

//show hide function is used for showing / hiding an element
function showhide(showhideid)
{
	if( document.getElementById('submenu'+showhideid).style.display == 'none' )
	{ 
		document.getElementById('submenu'+showhideid).style.display = 'block';
	}
	else 
	{  
		document.getElementById('submenu'+showhideid).style.display = 'none';
	}
}


function openmessagebox()
{
	if (document.getElementById('menu_container')){document.getElementById('menu_container').style.display = 'none'};
	if (document.getElementById('productinfo')){document.getElementById('productinfo').style.display = 'none'};
	if (document.getElementById('subject')){document.getElementById('subject').style.display = 'none'};
	if (document.getElementById('messagebox')){document.getElementById('messagebox').style.display = 'block'};
}


function closemessagebox()
{
	if (document.getElementById('menu_container')){document.getElementById('menu_container').style.display = 'block'};
	if (document.getElementById('productinfo')){document.getElementById('productinfo').style.display = 'block'};
	if (document.getElementById('subject')){document.getElementById('subject').style.display = ''};
	if (document.getElementById('messagebox')){document.getElementById('messagebox').style.display = 'none'};
}

function selecttab(i, numberOfTabs){
	
	if (document.getElementById){
		for (f=1;f<numberOfTabs+1;f++)
		{
			//alert("document.getElementById('contentblock'" + f + ").style.display='none'");
			document.getElementById('contentblock'+f).style.display='none';
			document.getElementById('link'+f).className ='taboff';
		}
		document.getElementById('contentblock'+i).style.display='block';
		document.getElementById('link'+i).className ='tabon';
	}
}