/*
	 * The following function will return the value of screen width.  If the 
	 * user has an old browser, then screen width is returned as 640 by default
	 */
	function getScreenWidth()
	{
	  var screenW = 640; 
    if (parseInt(navigator.appVersion)>3) {
     screenW = screen.width;
    }
    else if (navigator.appName == "Netscape" 
        && parseInt(navigator.appVersion)==3
        && navigator.javaEnabled()
       ) 
    {
     var jToolkit = java.awt.Toolkit.getDefaultToolkit();
     var jScreenSize = jToolkit.getScreenSize();
     screenW = jScreenSize.width;
    }
		return screenW;
	}

	/*
	 * The following function will return the value of screen height.  If the 
	 * user has an old browser, then screen width is returned as 480 by default
	 */
	function getScreenHeight()
	{
	  var screenH = 480; 
    if (parseInt(navigator.appVersion)>3) {
     screenH = screen.height;
    }
    else if (navigator.appName == "Netscape" 
        && parseInt(navigator.appVersion)==3
        && navigator.javaEnabled()
       ) 
    {
     var jToolkit = java.awt.Toolkit.getDefaultToolkit();
     var jScreenSize = jToolkit.getScreenSize();
     screenH = jScreenSize.height;
    }
		return screenH;
	}
	
	/*
	 * function to check for validity of the specified email
	 */
function checkEmail(emailAddress){
  var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
  if (filter.test(emailAddress))
    return true;
  else{
  	return false;
  }
}