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.vendor,
			subString: "Apple",
			identity: "Safari"
		},
		{
			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"
		},
		{		// 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.platform,
			subString: "Linux",
			identity: "Linux"
		}
	]

};
BrowserDetect.init();

function toggle(object) {
  if (document.getElementById) {
    if (document.getElementById(object).style.visibility == 'visible')
      document.getElementById(object).style.visibility = 'hidden';
    else
      document.getElementById(object).style.visibility = 'visible';
  }

  else if (document.layers && document.layers[object] != null) {
    if (document.layers[object].visibility == 'visible' ||
        document.layers[object].visibility == 'show' )
      document.layers[object].visibility = 'hidden';
    else
      document.layers[object].visibility = 'visible';
  }

  else if (document.all) {
    if (document.all[object].style.visibility == 'visible')
      document.all[object].style.visibility = 'hidden';
    else
      document.all[object].style.visibility = 'visible';
  }

  return false;
}

function nextthree(that,num) {
	if ( that.value.length == 3) {
		that.form.elements[num].focus();
	}
}
function nextfour(that,num) {
	if ( that.value.length == 4) {
		that.form.elements[num].focus();
	}
}

function validateForm () {
	if ((Number(document.dslprequal.elements[0].value) < 0) || (isNaN(document.dslprequal.elements[0].value)) || (document.dslprequal.elements[0].value.length < 3)) {
		alert ("Please enter a valid phone number.");
		document.dslprequal.elements[0].focus();
		return false;
	}
        if ((Number(document.dslprequal.elements[1].value) < 0) || (isNaN(document.dslprequal.elements[1].value)) || (document.dslprequal.elements[1].value.length < 3)) {
                alert ("Please enter a valid phone number.");
		document.dslprequal.elements[1].focus();
                return false;
        }
        if ((Number(document.dslprequal.elements[2].value) < 0) || (isNaN(document.dslprequal.elements[2].value)) || (document.dslprequal.elements[2].value.length < 4)) {
                alert ("Please enter a valid phone number.");
		document.dslprequal.elements[2].focus();
                return false;
        }
        if ((Number(document.dslprequal.elements[3].value) < 0) || (isNaN(document.dslprequal.elements[3].value)) || (document.dslprequal.elements[3].value.length < 5)) {   
                alert ("Please enter a valid zip code.");
		document.dslprequal.elements[3].focus();
                return false;
        }
    toggle('hiddenLayer');
	return true;
}