function window_onload()
{

// this is for all the dropdowns.
	var f = 0;
	for (f=0;f<document.forms.length;f++)
	{
		var elements = document.forms[f].elements;
		// looping through all elements on certain form

		for (e = 0; e < elements.length; e++)
		{
			if (elements[e].type == "select")
			{
				elements[e].style.visibility = 'hidden';
			}
		}
  }
 if(document.getElementById('slider') != null)
  {
	 document.getElementById('slider').style.visibility = 'hidden';
  }
}

function window_offload()
{

// this is for all the dropdowns.
	var f = 0;
	for (f=0;f<document.forms.length;f++)
	{
		var elements = document.forms[f].elements;
		// looping through all elements on certain form
		for (e = 0; e < elements.length; e++)
		{
			if (elements[e].type == "select")
			{
			   elements[e].style.visibility = 'visible';
			}
		}
  }
 if(document.getElementById('slider') != null)
  {
	 document.getElementById('slider').style.visibility = 'visible';
  }
}