function f_href(attr,val){
	var arr = location.href.split('?');
	if(arr[1] != undefined){
		var url = arr[0];
		var arr1 = arr[1].split('&');
		for(var j=0;j<attr.length;j++){
			var t = true;
			for(var i=0;i<arr1.length;i++){
				var tmp = arr1[i].split('=');
				if(attr[j] == tmp[0]){
					tmp[1] = val[j];
					t = false;
				}
				arr1[i] = tmp.join('=');
			}
			if(t) arr1.push(attr[j]+'='+val[j]);
		}
		location.href = url+'?'+arr1.join('&');
		//alert(url+'?'+arr1.join('&'));
		return;
	}
	url = arr[0]+'?';
	for(var i=0;i<attr.length;i++){
		if(i != 0) url += '&';
		url += attr[i]+'='+val[i];
	}
	//alert(url);
	location.href = url;
}