function buildTargetAudiences()
{
	var spans = document.getElementsByTagName('SPAN');
	for(var i=0;i<spans.length;i++)
	{
		switch(spans[i].className)
		{
			case 'taAdult':
			case 'taChild':
			case 'taSpecialist':
			spans[i].onclick = function(){
				if(this.className.indexOf(' ta_hover')==-1)
				{
					this.className+=' ta_hover';
				}
				else
				{
					this.className = this.className.split(' ta_hover')[0];
				}
			}
			break;
		}
	}
}