function blocksInit(){
	
	var blocks = Element.select(document.body,'.block');
	for(var i=0,node;node=blocks[i++];){
		Event.observe(node,'mouseover',function(event) {
			this.addClassName('block_active');
		} );
		Event.observe(node,'mouseout',function(event) { 
			this.removeClassName('block_active');
		} );
	}
	
	
	
}