var isNav6 = false;
var isIE5 = false;
var isIE6 = false;
var isIE7 = false;

var image = new Image();
image.src = "images/fileLight.jpg";

if(navigator.appName == "Netscape")
  {
   if(navigator.appVersion.charAt(0) >= "5")
    {
    isNav6 = true;
    }
  }

else if(navigator.appName == "Microsoft Internet Explorer")
  {
  if(navigator.appVersion.indexOf("MSIE 5") != -1)
    {
    isIE5 = true;
    }
  else if(navigator.appVersion.indexOf("MSIE 6") != -1)
    {
    isIE6 = true;
    }
  else if(navigator.appVersion.indexOf("MSIE 7") != -1)
    {
    isIE7 = true;
    }
  }



function glow(which)
{
document.getElementById(which).style.backgroundImage = "url(images/fileLight.jpg)";
}

function noglow(which)
{
document.getElementById(which).style.backgroundImage = "url(images/fileDark.jpg)";
}



// DROP DOWN FUNCTIONS

function invisible()
{
document.getElementById('ratesDIV').style.visibility = "hidden";
document.getElementById('apartmentDIV').style.visibility = "hidden";
document.getElementById('contactDIV').style.visibility = "hidden";
}


function glowDropDown(which)
{
document.getElementById(which).style.backgroundColor = "#AABCE7";
}

function noglowDropDown(which)
{
document.getElementById(which).style.backgroundColor = "#6A758F";
}


function visible(which)
{
switch(which)
	{
	case 'apartments':
		glow('apartments');
		document.getElementById('apartmentDIV').style.visibility='visible';
		document.getElementById('contactDIV').style.visibility = "hidden";
		document.getElementById('ratesDIV').style.visibility = "hidden";
		break;
	case 'rates':
		glow('rates');
		document.getElementById('ratesDIV').style.visibility='visible';
		document.getElementById('apartmentDIV').style.visibility = "hidden";
		document.getElementById('contactDIV').style.visibility = "hidden";
		break;
	case 'contact':
		glow('contact');
		document.getElementById('contactDIV').style.visibility='visible';
		document.getElementById('apartmentDIV').style.visibility = "hidden";
		document.getElementById('ratesDIV').style.visibility = "hidden";
		break;
	}
}


// FORM VALIDATION

function isEmpty(field)
{
str = field;
if(str == "")
  {
  return true;
  }
else
  {
  for(j=0; j<str.length; j++)
    {
    if(str.charAt(j) != " ")
      {
      return false;
      }
    }
  }
return true;
}

function containsNumbers(str)
{
for(j=0; j<str.length; j++)
  {
  c=str.charAt(j);
  if(c >= "0" && c <= "9")
    {
    return true;
    }
  }
return false;
}

function validNumber(str)
{
var notNumber = 0;
for(j=0; j<str.length; j++)
  {
  c=str.charAt(j);
  if((!(c >= 0) && !(c <= 9)) && c != '-' && c !='(' && c!=')' && c!= ' ' && c!= '+')
    {
    notNumber++; 
    }
  }
if (notNumber > 0)
  {
  return true;
  }
else
  {
  return false;
  }
}


// TO LIMIT THE TEXT ENTERED INTO A TEXTAREA


function limitText(limitField, limitCount, limitNum) 
{
if (limitField.value.length > limitNum) 
	{
	limitField.value = limitField.value.substring(0, limitNum);
	} 
else 
	{
	limitCount.value = limitNum - limitField.value.length;
	}
}