function actionStyleChange(){
	// Get the text to change
	var text = document.getElementById('sample').getElementsByTagName('p');
	
	// Ascertain which button has been pushed and set a new id value accordingly.

	var newId;
	if (this.name == 'big'){
		newId = 'big';
	}else if (this.name == 'bright'){
		newId = 'bright';
	}else if (this.name == 'soft'){
		newId = 'soft';
	}else if (this.name == 'dark'){
		newId = 'dark';
	}
	else{
		newId = '';
	}
	
	
	// Apply the chosen style to each paragraph.
	for (var i=0; i<text.length; i++){
		text[i].class = newId;
	}
}