function compare_yacht(yid) {
	
	if(typeof(yid) == "number") {		
		var yacht = document.getElementById("Compare" + yid);
		if(typeof(yacht) == "object") {
			
			// add
			if(yacht.checked) {
				
				// alert("adding");
				var url = '/compares/add/' + yid;
				new Ajax.Request(url, {
				  method: 'get',
				  requestHeaders:['X-Update', 'javascript']
				});
				
			} 
			// delete
			else {
				
				// alert("removing");
				var url = '/compares/delete/' + yid;
				new Ajax.Request(url, {
				  method: 'get',
				  requestHeaders:['X-Update', 'javascript']
				});

			} 
		
		} // yacht checkbox exists
	} // number
	
} // compare_yacht