Use to hide or show an element. Requires button to toggle, element to hide and label for button.

toggleVisibility.js

function flipHSpara(btn, para, label)
{
	var button = document.getElementById(btn);
	var parastyle = document.getElementById(para).style;
	label = label || '';		//http://javascript.info/tutorial/arguments
	if (parastyle.display==='none')
		{parastyle.display='block'; button.value='Hide ' + label ;}
	else
	{
		parastyle.display='none'; button.value='Show ' + label;
	}
}