function of(object) {
  if (document.getElementById) {
    document.getElementById(object).style.display = 'none';
  }
  else if (document.layers && document.layers[object]) {
    document.layers[object].display = 'none';
  }
  else if (document.all) {
    document.all[object].style.display = 'none';
  }
}
function on(object) {
  if (document.getElementById) {
    document.getElementById(object).style.display = 'inline';
  }
  else if (document.layers && document.layers[object]) {
    document.layers[object].display = 'inline';
  }
  else if (document.all) {
    document.all[object].style.display = 'inline';
  }
}

function swap_content( div ) 
{ 
	for(i=0;i<document.getElementsByTagName('div').length;i++) 
		{ 
			if(document.getElementsByTagName('div')[i].id.indexOf("pop")!=-1) 
		{ 
			if(document.getElementById( div )==document.getElementsByTagName('div')[i]) 
		{ 
			displayType = ( document.getElementById( div ).style.display == 'none' ) ? 'block' : 'none'; 
			document.getElementById( div ).style.display = displayType; 
		} 
	else 
		{ 
			document.getElementsByTagName('div')[i].style.display="none"
		} 
		} 
		} 
}