function isBrowser(nameAndVersion) {
  BrowserDetect.init();

  switch (BrowserDetect.browser) {
    case 'Safari':
      if (nameAndVersion == 'Safari') { return true; }
      break;
    case 'Opera':
      if (nameAndVersion == 'Opera') { return true; }
      break;
    case 'Firefox':
      if (nameAndVersion == 'Firefox') { return true; }
      break;
    case 'Chrome':
      if (nameAndVersion == 'Chrome') { return true; }
      break;
    case 'Explorer':
      switch (BrowserDetect.version) {
        case 6:
          if (nameAndVersion == 'Explorer6') { return true; }
          break;
        case 7:
          if (nameAndVersion == 'Explorer7') { return true; }
          break;
        case 8:
          if (nameAndVersion == 'Explorer8') { return true; }
          break;
        default:
          break;
      }
      break;
    default:
      break;
  }
}

var BrowserDetect = {
  init: function() {
    this.browser = this.searchString(this.dataBrowser) || "An unknown browser";
    this.version = this.searchVersion(navigator.userAgent) || this.searchVersion(navigator.appVersion) || "an unknown version";
    this.OS = this.searchString(this.dataOS) || "an unknown OS";
  },
  searchString: function(data) {
    for (var i = 0; i < data.length; i++) {
      var dataString = data[i].string;
      var dataProp = data[i].prop;
      this.versionSearchString = data[i].versionSearch || data[i].identity;
      if (dataString) {
        if (dataString.indexOf(data[i].subString) != -1)
          return data[i].identity;
      }
      else if (dataProp)
        return data[i].identity;
    }
  },
  searchVersion: function(dataString) {
    var index = dataString.indexOf(this.versionSearchString);
    if (index == -1) return;
    return parseFloat(dataString.substring(index + this.versionSearchString.length + 1));
  },
  dataBrowser: [
        {
          string: navigator.userAgent,
          subString: "Chrome",
          identity: "Chrome"
        },
		    { string: navigator.userAgent,
		      subString: "OmniWeb",
		      versionSearch: "OmniWeb/",
		      identity: "OmniWeb"
		    },
		    {
		      string: navigator.vendor,
		      subString: "Apple",
		      identity: "Safari",
		      versionSearch: "Version"
		    },
		  	{
		  	  prop: window.opera,
		  	  identity: "Opera"
		  	},
			  {
			    string: navigator.vendor,
			    subString: "iCab",
			    identity: "iCab"
			  },
			  {
			    string: navigator.vendor,
			    subString: "KDE",
			    identity: "Konqueror"
			  },
			  {
			    string: navigator.userAgent,
			    subString: "Firefox",
			    identity: "Firefox"
			  },
			  {
			    string: navigator.vendor,
			    subString: "Camino",
			    identity: "Camino"
			  },
			  {		// for newer Netscapes (6+)
			    string: navigator.userAgent,
			    subString: "Netscape",
			    identity: "Netscape"
			  },
		  	{
		  	  string: navigator.userAgent,
		  	  subString: "MSIE",
		  	  identity: "Explorer",
		  	  versionSearch: "MSIE"
		  	},
		  	{
		  	  string: navigator.userAgent,
		  	  subString: "Gecko",
		  	  identity: "Mozilla",
		  	  versionSearch: "rv"
		  	},
			  { 		// for older Netscapes (4-)
			    string: navigator.userAgent,
			    subString: "Mozilla",
			    identity: "Netscape",
			    versionSearch: "Mozilla"
			  }
		  ],
  dataOS: [
		    {
		      string: navigator.platform,
		      subString: "Win",
		      identity: "Windows"
		    },
		    {
		      string: navigator.platform,
		      subString: "Mac",
		      identity: "Mac"
		    },
		    {
		      string: navigator.userAgent,
		      subString: "iPhone",
		      identity: "iPhone/iPod"
		    },
		    {
		      string: navigator.platform,
		      subString: "Linux",
		      identity: "Linux"
		    }
	    ]
};