function ToggleTabOn(o)
	{
		var id = o.id;
		SetAllTabsOff();
		SetTabOn(id);
	}
	
	function SetAllTabsOff()
	{
		SetTabOff('WELCOME');
		SetTabOff('CHARTERSERVICES');
		SetTabOff('RUSLANAIRCRAFT');
	}
	
	function SetTabOff(id)
	{
		var objTab = document.getElementById(id);
		var objContent = document.getElementById('CONTENT_' + id);
		var curImg = objTab.src;
		objTab.src = curImg.replace('_on','_off');
		objContent.style.display = 'none';
	}

	function SetTabOn(id)
	{
		var objTab = document.getElementById(id);
		var objContent = document.getElementById('CONTENT_' + id);
		var curImg = objTab.src;
		objTab.src = curImg.replace('_off','_on');
		objContent.style.display = '';
	}
	
	function DisplayImage(id)
	{
		for (var i=1; i<=100; i++)
		{
			try
			{
				document.getElementById('BigPicture' + i + 'AndDescription').style.display='none';
			}
			catch(e)
			{
				// do nothing
			}
		}
		document.getElementById('BigPicture' + id + 'AndDescription').style.display='';
	}

	
	function ToggleMenuImg(img,onoff)
	{
			var obj=document.getElementById('img'+img);
			obj.src = obj.src.replace('_' + 'on','_' + onoff);
			obj.src = obj.src.replace('_' + 'off','_' + onoff);
	}

	function setOpacity(obj, v)
	{
		setOpacityForVariousBrowsers(obj, v);
	}
	
	function setOpacityForVariousBrowsers(obj, v)
	{
		obj.style.filter='alpha(opacity='+String(v)+')';
		obj.style.opacity = (v / 100); 
	    obj.style.MozOpacity = (v / 100); 
    	obj.style.KhtmlOpacity = (v / 100); 
	}	
	
	function ValidateMessage()
	{
		var strMsg = '';
		if(document.getElementById('txtFirstName').value=='' || document.getElementById('txtFirstName').value=='First Name:') strMsg += 'You must enter a First Name\n';
		if(document.getElementById('txtLastName').value=='' || document.getElementById('txtLastName').value=='Last Name:') strMsg += 'You must enter a Last Name\n';
		if(document.getElementById('txtTelephoneNumber').value=='' || document.getElementById('txtTelephoneNumber').value=='Telephone Number:') strMsg += 'You must enter a Telephone Number\n';
		if(document.getElementById('txtEmail').value=='' || document.getElementById('txtEmail').value=='Email:') strMsg += 'You must enter an Email address\n';
		if(document.getElementById('txtMessage').value=='' || document.getElementById('txtMessage').value=='Message:') strMsg += 'You must enter a Message\n';
		if(document.getElementById('captchacode').value=='' || document.getElementById('captchacode').value==' Enter Code:' || document.getElementById('captchacode').value=='Enter Code:') strMsg += 'You must enter the code from the validation image   \n';
		if(strMsg != '') 
		{
			alert(strMsg);
			return false;
		}
		return true;
		
	}

	function ValidateCallBackRequest()
	{
		var strMsg = '';
		if(document.frmRequest.txtYourName.value=='' || document.frmRequest.txtYourName.value=='Your Name:') strMsg += 'You must enter a Name\n';;
		if(document.frmRequest.txtTelephoneNumber.value=='' || document.frmRequest.txtTelephoneNumber.value=='Telephone Number:') strMsg += 'You must enter a Telephone Number\n';
		if(document.frmRequest.txtCompanyName.value=='' || document.frmRequest.txtCompanyName.value=='Company Name:') strMsg += 'You must enter a Company Name\n';
		if(strMsg != '') 
		{
			alert(strMsg);
			return false;
		}
		return true;
	}

function PopupWindow(url, name, h, w)
{
    var nw = window.open(url,name,'height=' + h + ',width=' + w );
    nw.focus();
}