window.onload=function() {
	
	if (document.referrer != '') {
	
		var ref = document.referrer;

		var sexp1 = /.*\.google\..*/
		var sexp2 = /.*\.yahoo\..*/
		var sexp3 = /.*\.bing\..*/
	
		var mexp1 = /q=(.*?)&/
		var mexp2 = /p=(.*?)&/
		var mexp3 = /q=(.*?)&/
	
		var se;
		var kpx;
		var kp;

		if (ref.search(sexp1) != -1) {
	
			se = "google";
			kpx = ref.match(mexp1);
		
			if (kpx[1] != '') {
				kp = kpx[1];
			}
		
		} else if (ref.search(sexp2) != -1) {
		
			se = "yahoo";
			kpx = ref.match(mexp2);
		
			if (kpx[1] != '') {
				kp = kpx[1];
			}
		
		} else if (ref.search(sexp3) != -1) {
		
			se = "bing";
			kpx = ref.match(mexp3);
		
			if (kpx[1] != '') {
				kp = kpx[1];
			}
		
		}
	
		var parameters = "engine=" + se + "&keyphrase=" + kp;
   		i = new Image(1, 1); 
		i.src = '/tools/referrertron/gather.php?' + parameters;
		
	}
	
}