function select_cats(el,catid){

	var selectlinks = document.getElementById('container-product-select-choice').getElementsByTagName('a');
	for(var i=0;i<selectlinks.length;i++){
		selectlinks[i].className = '';
	}
	el.className = 'current';
	
	var productdivs = document.getElementById('product-select-overview').getElementsByTagName('div');
	for(var i=0;i<productdivs.length;i++){
		if(/(product-block)/.test(productdivs[i].className)){
			if(productdivs[i].className.search('cat'+catid)==-1){
				$(productdivs[i]).animate({
					opacity: 0.15,
				},300);
			} else {
				$(productdivs[i]).animate({
					opacity: 1,
				},300);
			}
		}
	}
	
	return false;
	
}