function toggle( elementid )
  {
    if (document.getElementById( elementid ).disabled == true) {
  		document.getElementById( elementid ).disabled=false;
	} else {
		document.getElementById( elementid ).disabled=true;
	}
  }

function showHide( elementid )
  {
    if (document.getElementById( elementid ).style.display == 'inline') {
  		document.getElementById( elementid ).style.display='none';
	} else {
		document.getElementById( elementid ).style.display='inline';
	}
  }

function hideThis( elementid )
  {
    if (document.getElementById( elementid ).style.display == 'inline') {
  		document.getElementById( elementid ).style.display='none';
	}
  }

function showThis( elementid )
  {
    if (document.getElementById( elementid ).style.display == 'none') {
  		document.getElementById( elementid ).style.display='inline';
	}
  }
  
function changeImg( elementid )
  { 
  	var arrowRight = new Image;
	var arrowDown = new Image;
	arrowRight.src = 'images/arrow_right.gif';
	arrowDown.src = 'images/arrow_down.gif';
	
	  if (document.getElementById(elementid).src == 'images/arrow_right.gif') {
  		  document.getElementById(elementid).src = arrowDown.src;
	  } else {
		  document.getElementById(elementid).src = arrowRight.src;
	  }
  }  

function changeFormValue(id, new_value)
{
  if (id.length == 0)
  {
    return;
  } else {
    document.getElementById(id).value = new_value;
    return true;
  }
}

function changeMultiFormValue(id, formid, new_value)
{
  if (id.length == 0)
  {
    return;
  } else {
    x = document.getElementById(formid);
	for ( i = 0; i <= x.length-1; i++ )
	{
		if (x[i].name == id) {
			x[i].value = new_value;
		    return true;
		}
	}
  }
}

function changeFormSelect(id, new_value)
{
  if (id.length == 0)
  {
    return;
  } else {
    document.getElementById(id).selectedIndex = new_value;
    return true;
  }
}

function changeRow( id, color )
{
	var row = document.getElementById( id );
	var cells = row.getElementsByTagName( 'td' );
	for ( i = 0; i <= cells.length-1; i++ )
	{
		cells[i].style.backgroundColor=color;
	}
}

function goToURL( url )
{
window.location=url
}

function changeBackground(id, new_value)
{
  if (id.length == 0)
  {
    return;
  } else {
    document.getElementById(id).style.background = new_value;
    return true;
  }
}